About Experts Sitemap - Group 19 - Page 12 2016-09-20

Electrical Engineering: Battery
Yes, the battery is safe as you describe it. However, due to its age it is likely there is little charge left in it and you might find that it will not operate whatever you install it into. If you have a voltmeter you could easily find out if their is...

Electrical Engineering: Electronic Security Lock for Aeroplane Ignition.
Yes, it is not a question of technology, but rather if it provides a needed solution. There are other safety and security measures for this type of aircraft. They being very expensive already have secure systems built in. I think various manufacturers...

Electrical Engineering: Battery
Electrical Engineering: Battery

Electrical Engineering: Fixing whiteboard in four Wheeler vehicle.
Yes, it is possible; just do it. It must be mounted so as not to introduce a safety related matter. Anything with sharp corners used in a vehicle can be dangerous, PS: Starting from now I will be refusing questions that are not specifically related...

Electrical Engineering: Flashlights feature in two Wheelers.
Sorry, I have no opinion either way. I am not accustomed to parking places that do not have adequate lighting and vehicles that do not have working headlight systems. Even bicycles and motorcycles are equipped with lighting systems now days. Bicycles...

Electrical Engineering: Integrated Wall Electronic Digital Calendar and Clock product.
Yes. All of the items you mentioned are already in the market place. Maybe not exactly as you have described but in general encompassing the variations showing that your proposal would be a simple modification of those already available for purchase in many...

Electrical Engineering: Memory cards replacing RAM modules.
I think it could be done but why would one want to do it? For smooth trade over to memory card to do the RAM function would require engineering change. I see no advantage in doing so. However, I think you could use Memory Card to augment RAM where RAM...

Electrical Engineering: Power Banks for Portable Medical instruments.
A power bank, or power reserve pack, can be useful for occasions where one knows the internal battery will not provide sufficient power. Medical instruments generally draw more power from the battery than, for example, hand held devices. Therefore, extra...

Electrical Engineering: Smartphone Memory card repair.
Yes, depending, of course, on the actual failure. If it is physically damaged it may not be repairable. But here are some ways for repairing memory cards of various types, including those used by smartphones. http://smallbusiness.chron.com/repair-damaged-memory-cards-47334.html...

Electrical Engineering: Sound - scalar or vector?.
Yes, sound is either a vector or scalar. Vector is by definition a magnitude with an associated direction. Scalar is a magnitude number only with no direction involved. Sound emanates at a certain level or magnitude in, say, loudness. That is a scalar...

Electrical Engineering: Steering wheel security Lock.
http://www.aliexpress.com/item/New-car-steering-wheel-password-lock-car-anti-theft-lock-front-lock-car-safety-lock/1470222542.html The above system is a password protected locking system that can be used on any automobile or truck. It mounts on the steering...

Electrical Engineering: Stylus Pen for Portable Medical instruments.
Sorry, I know nothing about this field. I do know that medical/health providers are more and more using portable devices such as smartphones and tablets that connect them to other resources. A stylus pen is often used for that purpose. Beyond that level...

Electrical Engineering: Watching tv programs on smartphone device.
http://hookedondroid.com/watchmoviesondroid.html The above link talks about a site which feeds tv and movie programs that allow android phones to watch. The site mentioned in the above link has been closed down as far as I can tell. The moral to the...

Electrical Engineering: Wireless External Hard disk drive.
You seem to have a fascination with wireless capability of everything! Yes, of course adding wireless feature to external HD storage is easy to do. There are already such devices in the marketplace. Technology to do so is no problem. Here is an example:...

Electrical Engineering: solar lights
I just saw the youtube. It s not what I thought. He is only filling a plastic bottle with water to act as a lens. There is no solar power source of electricity. The water-filled bottle is placed upside-down in the ceiling/roof of the room. The sunlight...

Electrical Engineering: Alloys in insulators.
There is a wide range of insulation requirements for electric applications. In low voltage environments the choice is usually simple. In complex machinery motors and generators the enamels used are carefually formulated. In high voltage or high tension...

Electrical Engineering: CCTV monitoring System for Cable Cars - Aerial Tramway.
Why would you want to do so? Is there a market for such installations? Technology is readily available for such implementation. Cameras and monitors are easy. Transmission from cable car to monitor station is the decision to be made and it depends on...

Electrical Engineering: circuits
In figure 2.28, the answer is correct except that I3 is actually 2.5A. In figure 2.39, 5 in parallel with 20 is 4. 4 + 1 is 5. 5 in parallel with 20, = 4. 4 + 2 = 6. 9 in parallel with 18 = 6. The two 6 in parallel = 3. 3 in series with 16 = 19....

Electrical Engineering: Electronic components naming printing Technology
Yes, all colors are used, especially with small parts like a resistor with color bands around a cylindrical small device. Yes, very possible and used in all kinds of electrical and electronic components. Size and space to put the printing and marks is...

Electrical Engineering: Integrated Pocket Transistor and Power Bank Product.
Yes, but it is not a good match of power needs. ONE: The power bank if much larger and more battery power than a radio. TWO: Pocket radio needs only 1 AAA cell to run the radio for several hours. THREE: The power bank, depending on the unit, is designed...

Electrical Engineering: Irrigation water pumps.
Probably not possible to make a totally noiseless pump because the motions from the motor and water will always be present. You could build a sound insulating housing around the pump station to lower the noise a great deal. Now, it turns out that many...

Electrical Engineering: Motorman Train Driving Licence.
I know very little about this area; it does not relate to Electrical Engineering in a direct way. It seems the condition for approving operators of such conveyance vehicles may vary widely for different countries and sections of countries throughout the...

Electrical Engineering: Noiseless Electric Grinder Mixer.
Glass is not a good sound insulator as a general rule. A glass enclosure may reduce the high frequencies somewhat but will not attenuate the lower and more mechanical spectrum. I don t think glass is a very good idea but experimentation with a given design...

Electrical Engineering: Overload protection for Cable Car - Aerial Lift Tramway.
It is possible and I doubt if modern cable systems don t already have them. The design of such would be very similar technology to those used for elevators which you asked previously. It is not high technology as there are similar systems used with vehicles,...

Electrical Engineering: Portable Vacuum cleaner for Heavy vehicles.
Oh, I think they use them now. I do know they use portable or semi=portable vacuum cleaner in buses to get down between the seats and floor areas. They are quite pervasive in the utility and cleaning industry. For heavy duty cleaning they use powered vacuums...

Electrical Engineering: Reciprocating Motion in Electric motion.
A good reference on this subject is the wiki page that describes them, pictures and a listing of where some of them are utilized. https://en.wikipedia.org/wiki/Reciprocating_electric_motor and this youtube; https://www.youtube.com/watch?v=xDltrpk5uMA...

Electrical Engineering: Ship Geometrical Shape.
I doubt if ship designers have any particular geometric shape in mind as they develop their design program. Rather, the ship is designed to meet the needs of its purposes and motion power. Shaping it for the least resistance for movement in the water may...

Electrical Engineering: Traffic signals installation in Tunnels.
Yes, of course they can be difficult. Mostly they are connected via wires or cable from the outside world. In some tunnels radio links are used. I base my reply on personal observation and previous readings. However, in many cases the traffic signals are...

Electrical Engineering: transistor
RC is connected to ground through the power supply voltage. The resistance of collector circuit inside the grey area is a current generator which by definition is a very high value if not infinite and is connected, ac wise, through r c to ground. Thus...

Electrical Engineering: Troubleshooting Electrical Transformers., transformer testing
transformer testing: Yes, a multimeter with good low resistance ohmmeter can check for dc resistance of the coil which is good. But, for power transformers you must also have a hi-pot tester which test the high voltage for arcing over between coils and coil wires of the same...

Electrical Engineering: current
The circuit you show is using the electron flow convention which is no longer popular in engineering. Rather, we show current going from the plus terminal through the external circuit and back to the negative terminal of the battery source. Therefore,...

Electrical Engineering: equivalent resistance
No, no, no. The 10 ohm resistor is in series with those 4 resistors which are in parallel with each other. You must calculate the equivalent resistance. I will not do it for you but when in parallel the equivalent will always be less than the smallest...

Electrical Engineering: Food Storage and Processing Equipments in Aeroplanes.
Commercial flights that offer food services must have them for keeping food items hot or cold. There is no technical restrictions but some airplane forbid microwaves as they can be a possible source of interference with the communications and flight instrumentation...

Electrical Engineering: Multilingual Restaurant Website.
It will depend on whether or not there is a large multi language population and customer base for the firm. Here in the USA many food establishments already have language alternative webs and advertising materials. So, I think it could be a good idea....

Electrical Engineering: npn current
By convention, current flow is from positive to negative (it is not the direction of movement of electrons)). So your arrows point the wrong way to indicate current flow. The emitter current is the sum of collector and base currents. In your circuit:...

Electrical Engineering: protection from contact with various substances
I m not expert in barrier films and surface coatings. You can find an informative wiki page by googling your subject. It s a broad and highly technical field so you may need to consult with coating and film experts. At the materials level you will...

Electrical Engineering: tank circuit work
The LC tank circuit is like an electrical equivalent of a tuning fork: it will continue to oscillate at its resonant frequency. Here s something I paraphrased from Wikipedia: A capacitor in a parallel LC tank circuit stores energy in the electric field...

Electrical Engineering: Tea and Coffee vending machines.
Yes, of course it is possible to design such a vending machine. However, it would be very costly and impractical. Why? Because the electrical power requirements would be enormous and the batteries would either need to be extra huge or be recharged frequently....

Electrical Engineering: circuit
Your picture diagrams were not clear enough to read and I could not follow through your calculations. But, it is a simple problem of reduction through equivalent resistances. I think you did not reduce the resistances correctly. You cannot alter the circuit....

Electrical Engineering: CNG as Tractor Fuel System.
Yes, or course, and there are such tractors being used all over the world. However, there are two meanings to the word tractor ; those used in gardens and on the farm, and those used on the highways to pull semi-trailers loaded with merchandise. Both...

Electrical Engineering: Debit/Credit Combo card.
A card can be either one or both. Depends on the processing of the transaction by the merchant and the customer. Many cards as issued by a banking system can be designated to be processed either way at the transaction site. When the customer is at check...

Electrical Engineering: Diagram of a generator, including: armor, main field, auxiliary field, diode bridge, auxiliary armor.
Your question is too broad for a specific reply because there are so many types and designs. I suggest you consult a good college level text book on power engineering where you could find diagrams of various configurations. Finally, I am mostly an electronics...

Electrical Engineering: Digital IC Testing Facility in Digital Multimeter.
Well, there are many different families of IC chips; analog, digital, opamps, linear amplifiers, memory chips, etc. etc. This makes it impossible to make a simple testing device that can test all kinds. The pin configuration varies greatly and running...

Electrical Engineering: Dual Laser and Inkjet Integrated Printer.
Based on my knowledge of the printing mechanisms used with laser print and/or inkjet, they are totally incompatible technologies. Therefore, I see no way of making a combo printer utilizing both print mechanisms in the same printer mechanism. If it were...

Electrical Engineering: Gallium Arsenide.
I think not any time soon. Silicon is so heavily employed and the physics is so well understood that it will take some time for it to be replaced as the main line material for semiconductor usage. That being said, there is much research and testing going...

Electrical Engineering: Galvanometer, Ammeter and Voltmeter.
Both AC and DC measurements are included in the modern, conventional VOM (Voltage Ohm Meter). For most applications voltage, current and resistance (Ohms) are needed. However, there are dedicated meters that provide only one parameter, such as voltage or...

Electrical Engineering: Kirchoff's voltage law
Did you watch the youtube that I suggested in the last answer? That makes it very clear. To make it easy, the current always flows out of the plus terminal for electrical engineering cases. (Some of the electronics teachers and books use the electron...

Electrical Engineering: Typewriter reengineering.
In a typewriter the keys donot have the color. The key strikes the ribbon which transfers ink to the paper. The ribbon is usually just one color. All keystrokes have the same color. What you are describing is easily accomplished with printer and software....

Electrical Engineering: Biometric Finger Attendance Product Upgradation.
Not much. The power bank if rather inert add-on power supply to help charge up the smartphone when it runs out of power. I don t see the need for adding secure launching of external battery pack. What was your idea for it? I have no idea for it at...

Electrical Engineering: Black & White movies conversion to Color movies.
Converting black and white to color in the early days was a very intense hand labor. It required the film artist to add the colors frame by frame. It was very time consuming and labor intense and because it required artistic operators it was expensive. ...

Electrical Engineering: Compact Heatsinks Design.
Yes, there are many geometric configurations for heat sinks and engineers are always looking for more efficient packaging. But, the designs all must be able to dissipate the heat generated by the heat producing components in the electronic product. The...

Electrical Engineering: Facial Steam machine.
Yes, if the dc power supply has sufficient power output. Keep in mind that to produce steam requires a large amount of power to bring the temperature of the water to steam level. Portable batteries would not be sufficient; it would require a mains power...

Electrical Engineering: Factors affecting inductance
It is a non-linear function. That is, doubling the size of the core will not double the inductance of a given coil; tripling the core size will only increase the inductance little over the double size. And the permeability of the core is an important function...

Electrical Engineering: maximum number of Smartphones charged by Power Bank.
It depends on the charge amount held by the power bank and the smartphone battery requirements. But most low grade economy power bank are best with only one smartphone charge at a time. The link below explains the nature of different charging conditions...

Electrical Engineering: Smartphones integrated with Trackball Device.
Yes, smartphones can connect with trackball, but for what purpose. I don t know if there is an app for this function, but I haven t seen any purpose driven application. But its not an area I am comfortable with since there are so many millions of smartphone...

Electrical Engineering: Smartphones Interfacing with External Mouse Peripheral Device.
It is not a technical issue as much as a market driven user way of navigating the small screen rather than using hand gestures or pen/stylus. Using external mouse makes it more difficult due to the fact both hands would be occupied; one to operate the mouse...

Electrical Engineering: Sophisticated Toilet and Bathroom combined system design.
Most commercial aircraft have them. Especially those used for long distance travel. For overseas routes the airplane must have toilet facilities for the comfort of the passengers. The toilet facilities are designed especially for aircraft installation....

Electrical Engineering: Supermarkets in Rural areas.
This is a marketing question, not an engineering question. But, I do have some experience in this area. A supermarket by definition requires a very large inventory and high sales turnover with very low profit margin per item. Rural areas do not generally...

Electrical Engineering: USB Flash Device as Backup media on Servers.
Yes, folks have been using flash drives for backup ever since they become popular and inexpensive. Further the data is easily carried in ones pocket. But, now days, it is common to have more than one backup method; redundancy is desirable for security...

Electrical Engineering: Cable Cars Wipers.
Are you asking about windshield wipers? And why would they be needed? The cable car destination is predetermined by virtue of it being connected to the cable system. It is likely that cable cars already have windshield wipers which allow the operator...

Electrical Engineering: Cat6 cable for backbone network.
http://www.hca.hitachi-cable.com/cables/backbone-cable.php According to Hitachi in the above link Cat6 can be used. It says: Cat 3, 5e, 5a, 6, or 6a for Backbone Cable? Cat3 Cable is only used as a voice backbone cable between telecommunications...

Electrical Engineering: Color Fax Machine.
It is common for most fax machines of today to have default reception of color fax to print it out in b/w. Older machines cannot easily be upgraded because the entire print electronics, print engine and ink color must be changed. Actually, so many computers...

Electrical Engineering: Decompiler for any compiled programming language.
The link below is a long discussion on the very question: http://stackoverflow.com/questions/4842654/is-there-software-akin-to-an-ultimate-decompiler-that-will-work-for-any-langua It seems the question you ask is too broad. Narrowed down to open or...

Electrical Engineering: Digital Multimeter with Led Lights display.
Certainly, there are many examples in the marketplace: https://www.google.com/search?q=Digital+Multimeter+with+Led+Lights+display Why to you ask? There are many types of display technologies extant in meters and scientific instruments. You can google...

Electrical Engineering: Driving licence card updates.
Not a good idea for several reasons. In countries like here in the USA drivers buy and sell cars frequently and many own more than one vehicle whereas license to drive lasts several years. The administration at the license bureau and vehicle registration...

Electrical Engineering: Elevator electronic toy design and construction.
Such elevator controls are in almost every multi-story building throughout the world. Why would you think this could not be applied to a toy product. You could ask nearly any high school or college electronics student to design and construct such a control...

Electrical Engineering: Exhaust fan design.
The power requirements for fans is quite high compared with practicle batteries . For a ventilator fan to run for a significant length of time the battery would need to be big and expensive thus rendering it to be a very poor idea. So, while it s possible...

Electrical Engineering: Fax machine as a shared networking device.
But with software fax on pc or intelligent terminal you can access the fax commands any way one wishes. But with hardware fax it would not be so easy to do the command by remote access except some of the newer fax machines that have USB interface it is...

Electrical Engineering: Ferris/Giant Wheel Electronic toy design.
https://www.google.com/#q=remote+controlled+toy+ferris+wheel As you can see from the above, many have beat you to the draw on this one. You need to do a little basic google or bing research before sending in your questions that have basic, simple answers...

Electrical Engineering: Fixed Landline Telephone Power Requirement.
http://www.edaboard.com/thread199487.html Above discussion is very useful for you. Simple answer is that landline phones operate on about 48 volts dc and around 90 volts for the ringing circuit. The older phones operate off the voltage source coming...

Electrical Engineering: Four Wheeler Front Headlights Design.
It is purely application driven. Some owners like the extra lights for driving in the late evening in difficult to see areas. Some use them for hunting lights. Some like them just for the fun of it. They are after sales add-ons which the car dealer can...

Electrical Engineering: Helicopter Headlights.
Yes. Most of them do but location an d positioning depends upon the purpose of the helicopter. Those used for search and retrieval have the lights aimed towards the ground and are remote controled by the pilot or copilot. Those flying passengers have lights...

Electrical Engineering: Inverted polygons having odd number of sides.
Your question is too far away from electrical engineering and my field of experience. It is more in the math area. I recommend you to try mathematics experts. There are several interesting readings on your question if you do online searching with Google...

Electrical Engineering: Rechargeable or Non rechargeable batteries Thumb Rule.
Yes, of course. Most toys and other apparatus might work on C, D, aa or aaa size cells. There are recharge equivalent for each of these battery sizes that can be used in the same mounting slots. And other sizes as well. There are other battery options....

Electrical Engineering: RFID Door Systems with Remote Control Keys for Office Cabin Doors.
Yes. They are used for garage door openers all throughout the world. However, they are not necessarily based on RFID but similar self contained IC chips; same principle but less expensive and simpler implementation. Remote door control is very pervasive...

Electrical Engineering: Scientific calculator with Led lights.
Yes, to your question. If you are talking about LED displays for showing the entry results, most calculators currently use LED or LCD technology for this function. See the link below: http://www.ebay.com/bhp/led-calculator https://en.wikipedia.org/wiki/Calculator#Pocket_calculators...

Electrical Engineering: SMS Encryption.
Yes, of course. As a general rule any digital data file can be encrypted for safety, prying eyes and secure communications. The advantage for doing so is to increase security and enhance more secure communications with your colleagues. The disadvantage...

Electrical Engineering: Strongest Magnetic element.
Below link is a simple overview of magnetic and diamagnetic materials. http://www.school-for-champions.com/science/magnetic_materials.htm#.V5ZXC7grK70 Iron and Cobalt are very strongly magnetic but it depends on their formulation, geometric design and...

Electrical Engineering: T square and Set square construction materials.
Oh, No! Glass represents a safety hazard. If the instrument is dropped or gets broken the shards of glass can be very dangerous. Also, in a working environment the user would be required to wear safety glasses. It is not a good idea to use glass. ...

Electrical Engineering: amplified piezo led
It is not clear what you are talking about! Please explain further so I can dig into your request more deeply: What do you mean by amplified piezo ? A piezo crystal is a form of capacitor which when twisted or squeezed will produce a voltage OR visa...

Electrical Engineering: Connecting External speakers to LCD TV.
HDMI technology does not carry audio power. HDMI is used only for signal level connections. As mentioned some tv sets do have external audio power connections but mostly now days they do not. Why? Because external audio is mostly for surround sound and...

Electrical Engineering: Curious
Electricity is oderless and invisible. But its effects are very obvious and observable under the laws of physics. High voltages can cause the air around it to give off ozone and cause other effects on surrounding materials. If insulation is inadequate...

Electrical Engineering: Digital Portable X rays machine Interfacing with Smartphones.
Lots of new technology coming for x ray implementation. See links below: https://www.youtube.com/watch?v=7iBAn7HBeUM http://motherboard.vice.com/blog/x-ray-vision-is-coming-to-your-cell-phone http://gomerblog.com/2015/04/smartphone-app/ We must...

Electrical Engineering: Hydrocarbons mixture as Automobile fuels.
This question is outside the range of electrical engineering and I have no expertise in this subject so I have no answer of any consequence for you. You should seek other qualified fuel experts. I do know, however,that in many countries of the world certain...

Electrical Engineering: Integrated Inkjet Printer and Plotter Product.
It seems the design and technology of the two devices are not compatible and to integrate the functions would be tantamount to putting the printer and plotter inside one big box which would become a foolish solution. It does not seem a likely product could...

Electrical Engineering: Periodic table data in Excel software.
Already available and in the market. Just do a google and you ll find them; there are several options to choose from. It s a narrow market for the chemistry student and educational markets mostly. Some working in the field of chemistry would be users,...

Electrical Engineering: Thermocouple integrated with Smartphone device.
There are many smartphone variations and apps that include such features. It is not a new idea. Medical features for measuring body temperature, blood pressure, etc. are now on the market. Sensing devices of all kinds are being employed more and more each...

Electrical Engineering: What is the difference between mercury vapor lamp and metal halide lamp?
I shall answer the last question first: https://en.wikipedia.org/wiki/Mercury-vapor_lamp And on the above link go down to the operations section which explains that when the lamp is first turned on the gas pressure takes some time to build up and during...

Electrical Engineering: Difference between rated voltage and nominal voltage under standard from IEC or VDE
If you are talking about motors, for example, the nominal voltage is the voltage of the system (such as 480 volts). The rated voltage of the motor is the voltage actually expected at the motor (such as 460 volts), due to the voltage drop along the outside...

Electrical Engineering: Inductor core loss
I think you re on the right track. In magnetic circuits its always an approximation Only in well defined geometries and wide open spaces do we get calculations that are precise. In practical circuits the variation in atmospheric stray fields, imperfections...

Electrical Engineering: Installation of Intercoms in long distance express trains.
Yes. Go ahead. It would be basic technology solutions that could provide such type of communication system for trains. I it useful? Don t know but my opinion is it would be useless and confusing with the trains annunciation system that is one way and limited...

Electrical Engineering: Smartphones interfacing with portable book binding machines.
I am thinking the software is a significant development and would require a large amount of storage that would penalize the smartphone architecture. On the other hand most bookbinding now days is done using pdf conversion software which is then used as...

Electrical Engineering: 208v 3 Phase Power Aggregate Draw Higher Than Predicted, resistive loads, phase meter
resistive loads, phase meter, power tower: This is a little complicated to answer. Three phases with each one having 16 A is not the same as one phase having 48A. The currents in each of the three phases happen at a different time. The three lines have 120 degrees separation between the voltages...

Electrical Engineering: 220 to 110, voltage divider, national electricity
voltage divider, national electricity, welding machine: I think there is no practical, low cost way to do it. The current taken by the welder varies, it does not stay constant. So a voltage divider won t work. Your resistor burned because it had a lot of current going through it, and therefore was dissipating...

Electrical Engineering: 220V from China, amp service, ac wiring
amp service, ac wiring, ac service: You might want to get an electrician to help you, since it can be dangerous to install AC wiring. The electric dryer that may be in your home runs on 220 VAC. The AC service to your home has two 110VAC circuits, operating a 180 degrees out of phase with...

Electrical Engineering: 230-250 volts vs 110, maximum surge, sewing machine
maximum surge, sewing machine, wound motor: There is a surge current when starting this type of motor, so the maximum surge current is shown. The current when running is lower. The running power should be about 100 watts. Try to get a converter that says it is ok for running a motor. (This type of motor...

Electrical Engineering: 230 volt wye systems, heater coils, fault conditions
heater coils, fault conditions, distribution lines: Something is way wrong. Leg voltages must be nearly same. If not, the transformer may be way under rated and the loads on the different legs are not equal. You must check the power (KVA) rating of the transformer and make sure it is greater than the sum...

Electrical Engineering: 250 kw generators, windmill generators, kw generators
windmill generators, kw generators, propeller blades: There are many designs; there are many engineering and technical aspects to consider. Is your question application oriendted? or just theory? http://en.wikipedia.org/wiki/Wind_turbine The above site is one of the best in explaining the overview of wind...

Electrical Engineering: 3 phase 4wire delta output (high leg/wild leg), square root of 3, phase delta
square root of 3, phase delta, sine waves: Three phase is really intended for powering 3 phase apparatus such as motors and heavy machinery. It is a very efficient distribution system because it can get about the square root of 3 times more energy down the line with the same loss as single phase....

Electrical Engineering: 3 phase basics, 3 legs, screw type
3 legs, screw type, hot legs: Most North American service provide 120 and 240 voltage servcies; both in single phase and 3 phase. Actual distribution systems used by the power company are 3 phase and then at the local distribution center for a neighborhood they bring out single phase...

Electrical Engineering: 3-way wall switches, lighting departments, lowes
lighting departments, lowes, home depot: Fred, I sorry, but I am not qualified to answer questions about industrial and/or residential wiring. There may be a few web sites that can address your question properly. Or, go over to Home Depot or Lowes and check out some of the How-to books on electricity....

Electrical Engineering: 4-20mA Loop System, transmitter wires, electronic conversion
transmitter wires, electronic conversion, deg c: 1. A sensor is a transducer in most cases. Most often a sensor is a special type of transducer. For example, a loudspeaker is a transducer, but it is not a sensor. A piezo crystal can be both a transducer and a sensor. 2. Any signal can be transmitted....

Electrical Engineering: 4-20mA Loop, analog to digital converter, transmitter wires
analog to digital converter, transmitter wires, deg c: Hi Adam, It seems to me that there is some confusion abut the 4ma-20ma current loop. The current loop is a digital transmission means. If your temperature sensor is a digital sensor, then the digital information can be sent down the current loop, recieved...

Electrical Engineering: 4-20mA signal, sensor output, reading 4
sensor output, reading 4, temperature increases: I ll use an example of a temperature sensor that has a range of 20 degrees to 120 degrees. When you connect a power supply (usually 24VDC) to the sensor and measure the current that is powering the sensor, the current will be 4 mA when the temperature is 20...

Electrical Engineering: 400 hz generator, emergency power generator, surplus diesel
emergency power generator, surplus diesel, diesel generator: I m sorry to say that there is really no practical way to convert the alternator. However, you could use the diesel engine and replace the alternator with one that is designed for 220V 60 Hz. Alternators like that are available from Northern Tool. Hope...

Electrical Engineering: 555 monostable/astable pin 5 connection, rf signals, control amplifier
rf signals, control amplifier, timer functions: See, http://www.ee.iitb.ac.in/~teesa/presentations%20lectures%20workshops/electrified/480_555.htm which is a good overall explanation of the 555. Notice that pin 5 connects directly to an input to the control amplifier. If that input is open it...

Electrical Engineering: 555 pin 4 and RFI supression, astable circuit, ferrite cores
astable circuit, ferrite cores, monostable: With an astable or monostable connection, the reset pin is connected to V+. If you want to reset a monostable prior to its timeout, then you can momentarily bring the reset pin low to reset the timer. The suppressors you ask about are ferrite cores that...

Electrical Engineering: 60 Hz environment versus 50 Hz environment., space allotments, delicate electronic equipment
space allotments, delicate electronic equipment, amp breaker: Microwave is going to be okey at 50 Hz. Dish washer maybe okey. I would not run the washer on 50 Hz without verifying it with the manufacturer; there are cycles that involve moving parts that may not engage properly at the lower speeds. Also, you still...

Electrical Engineering: Will 60 hz kitchen appliances work adequetly in a 50 hz environment?, american appliances, drive turntable
american appliances, drive turntable, 60 hertz: Yes, Thailand is a 220v ac, 50Hz power source country. Small electronic appliances can be run using a converter easily. No overheating or power problems will occur, as a general rule. If you have a direct drive turntable it will not work properly as...

Electrical Engineering: 60Hz Device on a 50 Hz supply, subwoofer system, dc voltages
subwoofer system, dc voltages, power transformer: I wish you had given me the make and model number. That way I can be more specific in my answer. However, here are some generic comments. I am assuming this is a self-powered subwoofer system. (Subwoofer word used alone refers to just the speaker itself)....

Electrical Engineering: 60Hz Device on a 50 Hz supply, subwoofer, efficiency
subwoofer, efficiency, india: If you match the voltage correctly, it should be ok. The difference between the 50 and 60Hz will be in the efficiency of the transformer that s inside the subwoofer product. Usually the 50 HZ instead of 60Hz will not make a difference, but it could reduce...

Electrical Engineering: 6th grader, law of electricity, resistance of the wire
law of electricity, resistance of the wire, stretching the wire: Not sure if you are asking if the weight OF the wire or the weight ON the wire effects current flow. The weight OF the wire, such as weight per lineal foot would definitely have an effect; the larger weight would mean a larger diameter of the wire and the...

Electrical Engineering: 7-segment, 7 segment displays, zero suppression
7 segment displays, zero suppression, doctronics: Here is one example: http://www.electronics-lab.com/projects/test/014/index.html Here is another: http://www.rentron.com/BASIC_Stamps/SERLED.htm And another: http://info.hobbyengineering.com/specs/MAX7219.pdf The decimal point is controlled...

Electrical Engineering: 7-segment display, 7 segment displays, 74ls47
7 segment displays, 74ls47, zero suppression: Rizwan, My understanding is that you want the decimial point to move to keep the display reading in Khz. My answer is that you may need to control the decimal point seperately from the 74ls47. This involves additional logic or a small microprocessor or a...

Electrical Engineering: 7-segment, 7 segment displays, ohm resistor
7 segment displays, ohm resistor, series resistor: The 7447 does not drive the decimal point. You use a transistor and series resistor for each decimal point you might want to light. Then you drive the base of the transistor of the point that you want to light. For example, if you use common anode LEDs,...

Electrical Engineering: 7segment display, luck john, western africa
luck john, western africa, resistors: Wolfe, are you sure that this is the correct part number? It sounds very old. I suggest that you first search the web for some applications. I m getting a lot of questions from folks who are not even taking the first step by searching on the web to find...

Electrical Engineering: 8051 sensors, 8051 processor, motion sensors
8051 processor, motion sensors, input circuit: I listed myself as being on vacation last week. Somehow the website didn t pick it up. Sorry. There is a popular evaluation kit from Polaroid that includes their ultrasonic sensor, a PCB, and instructions. It has a voltage output. You d need to add an A/D...

Electrical Engineering: 8086/8088 difference b/w mov and jump, jump instruction, memory locations
jump instruction, memory locations, long long time: I don t know the answer to your question just now. I have not programmed these processors for long, long time. I will investigate and reply after doing my research. Give me a day or two. ============================================== Okey, here is...

Electrical Engineering: 8086/8088 microprocessor, olemiss edu, google search
olemiss edu, google search, google: There are so many downloads on the internet that you can catch. Please do a google search for the key words and you will find plenty to choose from. If you google 8086/8088 ascii instruction set you will get a listing of many to choose from. http://www.freebyte.com/programming/assembler/...

Electrical Engineering: 9v connection to a Tripple a battery connection, lithium batteries, carbon batteries
lithium batteries, carbon batteries, lithium battery: Well, 9v is 9v. So long as you have the right voltage and current capacity to run the camera you will be alright. Do you mean an A size lithium battery? A size carbon batteries are not listed. If using triple A lithiums, that will give you 3 times 3.6v...

Electrical Engineering: AC bias, amplitude modulation, signal amplitude
amplitude modulation, signal amplitude, composite signal: The heterodyning principle is a form of modulation. The purpose of this is to produce a constant output frequency such that regardless of what frequency the receiver is tuned to the output of the heterodying modulator and is called the IF or Intermediate...

Electrical Engineering: AC breakdown, compliance engineer, dielectric strength
compliance engineer, dielectric strength, vacuum systems: Jason, Your second assumption is correct. If a +/- 4kv signal is impressed across a system, the effective voltage felt by the system is 8KV. As far as frequency is concerned, I don t know what its effect is. My experience is limited in this application....

Electrical Engineering: AC/DC adapter, ac dc adapter, dxg 301v
ac dc adapter, dxg 301v, power pods: Yes, I understand completely. But I caution you to be careful. You don t want to destroy the batteries or the recorder by using the wrong power pod. I think of all the pod I looked at, the one previously mentioned would be safe. Digital Concepts...

Electrical Engineering: AC/DC adaptors, wireless mic system, power pod
wireless mic system, power pod, dc adaptors: I would have to know the make and model of the wireless mic system to give you a good answer. That being said - and knowing the relative design of a wirels mic - it is likely the alternate power pod will do the job nicely. HOWEVER: Make sure it has the...

Electrical Engineering: AC and DC Capacitor, bypass capacitor, electrolytic capacitor
bypass capacitor, electrolytic capacitor, capcitor: There is no such distinction as between an AC or DC capacitor. If you rectify an AC, the voltage will still vary from zero to the peak voltage. In order to filter it to a constant voltage, you add a capacitor across it. When the AC is rectified by a...

Electrical Engineering: AC and DC Capacitor, dynamic impedance, smooth dc
dynamic impedance, smooth dc, ac circuits: A capacitor is a capacitor; it is a storage device with two plates, which when charged, hold that charge and discharge it through its external circuit. Caps used in a DC circuit are to hold up the charge and keep the dynamic impedance of the circuit low....

Electrical Engineering: AC/DC Relay Circuit, dc relay, gfi outlet
dc relay, gfi outlet, dc electronics: Relays with external contacts for switching will hand the ac just fine. All you need is a very sensitive relay with dc coil OR an electronic switch to drive it. If you use a double pole double throw relay you can wire the ac any way you want: Relay ON,ac...

Electrical Engineering: AC motor direction, stator poles, armature windings
stator poles, armature windings, magnetic strength: It can be very difficult to tell the direction by looking at the motor when it is not powered. In any given position, the magnetic fields act to align the rotor and stator to a new position. That new position is , for example, clockwise of the present position....

Electrical Engineering: AC Peak detector application? Or missing portion detector?, internal circuitry, alternate ideas
internal circuitry, alternate ideas, peak detector: Yes, there are signal comparator circuits galore. Here is one already packaged that will do the job directly for an analog signal. http://www.sil.co.uk/pdf/pdfimage/112-22image.pdf There is a host of ICs that do these tasks at various frequencies,...

Electrical Engineering: AC Relay Signal to DC Dry Contact, ups uninterruptible power supply, apc ups
ups uninterruptible power supply, apc ups, network managment: The card is looking for a set of dry contacts, which means that it needs to have its two terminals shorted together, or not shorted together, to represent the two possible states. That s exactly what you ll get with your relay contacts available on the Firex...

Electrical Engineering: AC vs DC hz/Frequency, wall wart, clock radios
wall wart, clock radios, clock radio: Without the make and model I cannot give you a certain answer. However, most clock radios work off the line frequency for their reference to set the time because the power companies keep their frequency extremely close. Therefore, I think the clock will...

Electrical Engineering: Adapter voltage question, internal resistance, open circuit voltage
internal resistance, open circuit voltage, question question: I can assure you the 12v, 1amp pod will do the job. If you were worried about it you could put a voltage divider on the output of the supply and knock the voltage down 2 volts. You can do this by using a 2 ohm resistor with a wattage rating of at least...

Electrical Engineering: Adapter voltage question, low voltage regulator, signs of stress
low voltage regulator, signs of stress, input specification: Hello Max, The 10 volt supply that you describe seems rather odd. This is because I m used to seeing supply voltages of 6.3, 9, 12, 15 volts and such. Usually, devices have a range of input voltages, for instance 9-12 VDC as an input specification because...

Electrical Engineering: Adapter voltage question, internal circuitry, ebay
internal circuitry, ebay, power adapters: Most likely, 12V would not damage it, but you can t say for sure without knowing the internal circuitry. It s safer to use a 10V supply. I saw a 10V at 3A supply at http://cgi.ebay.ca/AC-110V-240V-DC-10V-3-0A-power-adapter-supply_W0QQitemZ250039779048QQihZ015QQcategoryZ50999QQcmdZViewItem...

Electrical Engineering: Adapter vs Charger, dc power adapter, charging battery
dc power adapter, charging battery, cads: Better not. Why? Because Ni-Cads - as well as most any battery - requires a charger that charges at a specified rate and tapers off as the battery becomes more fully charged and, as it reaches the full charge level, stops charging accept for a small trickle...

Electrical Engineering: Advice on LED Circuit, light chaser, power transistor
light chaser, power transistor, fading light: The normal way to make a light chaser is different from your request. Usually, every fourth light comes on at the same time. You use a 4 bit shift register to drive the lights. For example, with 100 lights, 25 of them will be connected to each bit. The first...

Electrical Engineering: AES carrier voltage, digital pcm, luck john
digital pcm, luck john, peak voltage: A long time ago, Philips had a chip that performed a similar function. I don t remember the part number. YOu may be able to go to the Philips webpage and look up audio ICs. The chip that I used took the AES digital PCm stream and extracted the audio information....

Electrical Engineering: Air Compressor motor malfunction, metal tabs, compressor motor
metal tabs, compressor motor, electrical motor: There are a lot of different ways to make motors. Most are not made for disassembly. You will probably have to pry back some metal tabs to get the end covers off. These often break when bending them back later. It s not easy to test the coils once you...

Electrical Engineering: Aircond starter, crankcase heater, crank case
crankcase heater, crank case, cold weather: The engine has a crankcase which hold the oil for lubricationg the internal engine parts. If it is used out of doors the oil will become thick and very viscous in cold weather. I crankcase heater is used to keep the oil warm so the engine can start easily...

Electrical Engineering: Aircond, phase angles, inductive effect
phase angles, inductive effect, goodday: http://ww1.microchip.com/downloads/en/AppNotes/00967A.pdf The above web shows a few equivalent circuits and the use of capacitors in correcting phase angles and getting the best current flow through the windings. Keep in mind, in order to fully analyze...

Electrical Engineering: Alr8 Dave, this is not a homework..., open collector outputs, seven segment display
open collector outputs, seven segment display, bcd output: I assume that you have a digital BCD output and want to drive a 7-segment LED. There is an IC for just this purpose, the 74LS47 (you can buy it from digikey.com). The 4 bits of the BCD go right into the chip. Then there are 7 open collector outputs. Use a...

Electrical Engineering: Alternator brushes, alternator brushes, peak currents
alternator brushes, peak currents, rf noise: Lots of current and switching transients. Peak currents can be very high; average current not so much. They typically generate lots of rf energy due to the transient nature of the pulse currents. Put a transistor radio near the alternator and you will pickup...

Electrical Engineering: AMPS and Volts, terminal screws, branch circuits
terminal screws, branch circuits, amps and volts: Robert, sounds like you got a nifty little project there. A little more info, please. This sounds like a dedicated room for computers. Are we talking about a network hub and router room, or a server room? And what kind of interfaces are we dealing with here...

Electrical Engineering: Ammeter selectiion, thought c, ammeters
thought c, ammeters, ampere: Seems to me you will need different ammeters for the primary and secondary. Some digital ammeters, however, can read accurately over the whole range; if the max is 150 amperes, it would still be able to provide an accurate reading at the 1 to 10 ampere level....

Electrical Engineering: Analog Signal Processing, resistor divider, voltage amplifier
resistor divider, voltage amplifier, log amp: Chris, Not sure I understand what you are doing and what alternate strategies may be sensible. Conceptually, you can use a simple resistor divider at the output of the PMT, pass it through an analog amplifier and merely set the output to trip an output...

Electrical Engineering: Analog Signal Processing, voltage amplifier, log amp
voltage amplifier, log amp, energy intensity: Chris, I read through your message and kind of understand your issue but it s difficult to make a recommendation without some additonal details about your application. I have a couple of specific questions: 1. How and/or what type of program or signal...

Electrical Engineering: Anodes in CRT, free electrons, deflection plates
free electrons, deflection plates, metal cylinders: First, the cathode is not necessarily at a negative potential. It is, rather hot from the filament coil that has sent the temperature high enough to have many free electrons ready for pulling off. Think of the second anode and other items as not being...

Electrical Engineering: Antenna's, field strength meter, ferrite core
field strength meter, ferrite core, dear dave: You can make it 1/4 wavelength, and it will work about 70% as good. You can make it work a little better than that by tuning it to be resonant at the transmit frequency. The actual best antenna length will be something like 5% shorter than the calculated...

Electrical Engineering: Applications for Equalization, antenna basics, magnetic antenna
antenna basics, magnetic antenna, antenna theory: In a vcr the audio head is the same as an audio player and the equalization in the playback preamp is the same. For the video it is a rotating head which is spinning at a very high rpm rate and the signal is modulated in a totally different way. The...

Electrical Engineering: Audio, computer sound cards, computer sound card
computer sound cards, computer sound card, audio engineering society: If the computer sound card has an AES/EBU input then there should be no problem. I don t know if one exists. Most computer sound cards are designed for a line level analog input and not a digital input. I don t have the AES spec. I may be available on...

Electrical Engineering: Automotive Electronics Circuits, honda motorcycle, electronics circuits
honda motorcycle, electronics circuits, turn signals: I feel your pain. You could measure the resistance of the light bulb, but that would only work it it didn t get hot! I would try a quite high value of resistor, because the sensing circuit would probably trigger on a minimum value, and wouldn t care if it...

Electrical Engineering: AVR, ac output voltage, automatic voltage regulator
ac output voltage, automatic voltage regulator, avr 2: There are AC and DC voltage and AC and DC current regulators. And, they are all quite different in concept and detail. So, can you please tell me which system you are thinking about and if you have a make and model number that would help, too. An AC...

Electrical Engineering: ac to ac conversion, google search, ac conversion
google search, ac conversion, motor shaft: Please do a google search on this and you will find several options. There are many ways to accomplish such a thing. ONE: Use of a 3 phase transformer which is really not a transformer, but a series of windings that alter the phase of each output and...

Electrical Engineering: advice needed for a project, transimpedance amplifier, luck john
transimpedance amplifier, luck john, farzana: Farzana, What you need is a device that converts light energy into an electronic signal. The electronic signal is then amplified and fed to a loudspeaker. What kind of device converts light to an electical signal? Check out photocells or photodiodes to...

Electrical Engineering: air conditioning motors, windings, aircon
windings, aircon, short circuit: It would likely not be sufficient voltage to make it turn. The motor would stay in a stalled position, hum for a long time until the windings burned out. You would start smelling the windings burning before they went open circuit - or short circuit. ...

Electrical Engineering: amp circuits, amp circuits, saturation voltage
amp circuits, saturation voltage, load resistor: Very simple. This is a complimentary symmetry push-pull class ab amplifier. You did not give me resistive values, but I am assuming they are in the 10k area. The junction between the two emitters will be biased such that at no signal condition the voltage...

Electrical Engineering: amplifier squelch circuit, receiver circuit, general discussion
receiver circuit, general discussion, electronics equipment: Nothing, really. Think of the squelch function as an automatic mute with some predetermined level set. I suppose a disadvantage could be that if the squelch level is set too tight it could cut out some important transmission. Also, it costs some to...

Electrical Engineering: antennas, antenna basics, antenna terminals
antenna basics, antenna terminals, antenna structures: Answer: In its simple form it is merely a catcher of electromagnetic waves that were sent by a receiver. Conversely, it can be a transmitter of those waves to be received by another antenna at a distant point. Some antenna structures are used to both...

Electrical Engineering: audio transformer, armaco, audio transformer
armaco, audio transformer, input the output: Darsh, I m not quite sure how to answer your question. A transformer is an AC device whose basis of operation is it s turns ratio. If the turns ratio is 2:1 then if an AC signal of 1vpp is applied to the input, the output voltage will be 2vpp. Joh...

Electrical Engineering: automotive electrical system, pulse width modulation, analog to digital converter
pulse width modulation, analog to digital converter, analog signals: The actual computing part of any modern computer only works with digital data. When analog signals must be read, that is done by first passing them through an analog to digital converter , also called an A/D (pronounced A to D ). After the signal is...

Electrical Engineering: Backup Parking Sensor, negative battery cable, backup light
negative battery cable, backup light, parking sensor: You have the backup sensor connected to an ignition lead. When the vehicle is turned off the light loses its voltage and will not reset. I think you must connect it to a constant 12v line so the power does NOT go off when the engine is shut down. Are you...

Electrical Engineering: Ballast, magnetic ballast, instantaneous voltage
magnetic ballast, instantaneous voltage, starter switch: The older type of fluorescent circuit used a starter switch (with a heater and bimetal switch. As long as the switch opened up when the AC instantaneous voltage was not near zero crossing, there would be enough current in the ballast coil to provide the...

Electrical Engineering: Battery Ah, type of rechargeable battery, internal resistance
type of rechargeable battery, internal resistance, ah battery: If a battery has a rating of 1 Ah, then it theoretically can supply a current of 1A for a time of 1 hour before it goes dead. Or, it can supply 0.1A for 10 hours. So that the product of current and time is still 1. But there is an upper limit of current,...

Electrical Engineering: Battery Charger as a battery pack?, voltage requirements, battery compartment
voltage requirements, battery compartment, solar panel: First, you must look at the battery compartment and you will see the connections to the batteries is probably different configuration from one unit to the other. But, as a rule, always lay the batteries in as the markings for the compartment show. If the...

Electrical Engineering: Battery Charginbg Amps, charging batteries, rules of thumb
charging batteries, rules of thumb, cabels: No; there are no rules of thumb. It is totally dependent upon the unique characteristics of the battery being used. You must have recommendations from the supplier of the batteries. There are some standardized cells that have published characteristics...

Electrical Engineering: Battery Charging, 12v battery charger, series resistor
12v battery charger, series resistor, series resistance: Well, they are really nearly the same concept. Look at it this way: Constant Voltage is when the voltage output from the charging circuit remains fixed. But, there is a resistance in series with the battery under charge. Consider this: A 12v battery...

Electrical Engineering: Battery Charging Amps, battery theory, memory conditions
battery theory, memory conditions, xah: In my experience there is great danger in following any rule of thumb for batteries. Most manufacturers are very particular about the charging rates and current levels for their batteries and exceeding them may violate the warranty or endanger the proper...

Electrical Engineering: Battery Charging Amps, charge batteries, xah
charge batteries, xah, rule of thumb: That is true and correct for many cases, but you have to check the specific cells that you are using to make sure that you have the correct charge rate. Quick charge batteries are sometimes charged at a much higher rate so that they can charge in less time....

Electrical Engineering: Battery Charging Condition, lithium battery, battery voltage
lithium battery, battery voltage, bank 1: It depends on the battery and on the charger circuit. If the battery is the type that has a memory, like NiCd, then it does not seem like a good system to me. They work best when completely discharged and then completely recharged. If it is lead-acid,...

Electrical Engineering: Battery Charging for jump start, dead battery, goodday
dead battery, goodday, jump start: The steps are created for safety and to make sure it is connected properly without error. In a large system if the polarity is connected backwards is can cause explosion of the battery and/or damage to the jump starting apparatus. If you really know...

Electrical Engineering: Battery Charging, ups system, voltage limit
ups system, voltage limit, charge voltage: You must give me a system design. If it is a large system, a few amps may be suitable. If for a home class pc, a few milliamps would be appropriate. Or, you could have a bad cell that is taking a constant charge because the voltage is not building up....

Electrical Engineering: Battery change, car battery charger, motorcycle batteries
car battery charger, motorcycle batteries, motorcycle battery: The only problem I see with mixing the two types of batteries is that charging them with a common charger may mean that 1 gets charged and the other will charge slowly. That is because even though the battery technology is probably similar, there are small...

Electrical Engineering: Battery Excessive Charging Amps, wet cell battery, external circuits
wet cell battery, external circuits, cell voltage: I don t know the big battery business so much anymore. It has been a few years since I delved into them. But, in the small battery area, such as Mallory, Eveready, Maxell, Panasonic and Ray0vac they all have manuals with much information about their small...

Electrical Engineering: Battery/electrochemical reaction, electrochemical reaction, free electrons
electrochemical reaction, free electrons, voltage difference: A battery does not create more electrons. It causes the atoms or molecules with extra electrons to be grouped toward one electrode, and the atoms or molecules with missing electrons to be grouped toward the other electrode. This causes a potential voltage...

Electrical Engineering: Battery Preservation, alkaline batteries, zip lock
alkaline batteries, zip lock, ambient temperature: I used to keep batteries in the refrigerator years ago (without a plastic bag). But now, the batteries are made to last much longer. If you are using alkaline batteries, there s no need to refrigerate them if you will use them within five years (their shelf...

Electrical Engineering: Battery Replacement?, uninterruptable power supply, voltage battery
uninterruptable power supply, voltage battery, luck john: George, You can use the 6v 4.5amp battery. The current rating just means that the battery can provide up to 4.5 amps/hr if necessary. This is better than the old battery whose maximum capacity was 4 amps/hr. If , however, the voltage rating was higher,...

Electrical Engineering: Battery Selection, removable caps, chem seal
removable caps, chem seal, vrla: Hi, Sorry, Malaysia..... Only short distance away! No, they are essentially the same battery - but packaged differently. The VLA type has the vent caps and can be moved around to different configurations whereas the normal wet cell battery must be...

Electrical Engineering: Bias-Rg, vacuum tube amplifiers, cathode bias
vacuum tube amplifiers, cathode bias, grid resistor: Simon, It is much less sinister. The purpose is to have a shunt path for electron build up on the grid. As you know, the current in a vacuum tube is indeed electrons that are boiled off the cathode. The high voltage on the plate will attract the electrons...

Electrical Engineering: Bicycle Generator, bicycle generator, generator motor
bicycle generator, generator motor, voltage level: Good question. Easy answer. Get a good 100v diode with a rating of at least 20amps and put it in the line between the bicycle generator and the battery. It should be connected with the arrow of the diode pointing to the bicycle. This will keep current...

Electrical Engineering: Bicycle Generator, diode cathode, bicycle generator
diode cathode, bicycle generator, diode anode: When you pedal the generator, one of the two leads is the positive one. You can check which one by using a voltmeter. Then you need to connect a diode in series so that the diode anode is connected to the generator positive lead and the diode cathode is...

Electrical Engineering: Bicycle Generator, bicycle generator, luck john
bicycle generator, luck john, motor generator: Bryan, Interesting project. You should get a book on basic electronics and look up diodes . Your problem is that the fan MOTOR can be used as a generator OR a motor. You want to use it as a generator so you must not allow current from the battery to enter...

Electrical Engineering: understanding transistors, transistor switches, bipolar transistor
transistor switches, bipolar transistor, silicon diode: Simon, I m finding it difficult to answer your question(s)mainly because of the broad scope of the questions. In order to understand how a transistor works you must know how to interpret the Current(I) vs. voltage(V) curve of a diode. The I vs. V curve...

Electrical Engineering: Bootstrapped Emitter follower, germanium transistors, voltage divider biasing
germanium transistors, voltage divider biasing, uoguelph ca: R im my equation is the resistor going from emitter to ground. It is the current limiting element of the emitter to collector current. In a typical small signal amplifier it will be a few kilo ohms. If it gets too low the distortion increases by virtue...

Electrical Engineering: BRUSHLESS GENERATOR, digital ohmmeters, diode tester
digital ohmmeters, diode tester, analog ohmmeter: Thanks for your feedback. It is helpful for me to understand more clearly what field you are working in and the type of equipment you are dealing with. So, could I ask you to give me some references regarding your question? Can you give me the websites...

Electrical Engineering: Breakdown, capacitor network, voltage multiplier
capacitor network, voltage multiplier, ac mains: You are shorting the mains, but through the impedance of the series multiplier capacitor network. So, the impedance of the caps is in series with the short. It will depend on the value of the caps as the impedance is a function of the frequency and the value...

Electrical Engineering: Bulding a Generator, diesel engine, maximum load
diesel engine, maximum load, maximum output: Not sure I understand the question. Do you need the coupling mechanism to attach the drive motor to the shaft of the armature? Or, do you need some idea on the size of the engine to drive the generator? https://sdp-si.com/eStore/Direct.asp?Exp1=30&CP=Couplings.htm&OVRAW=coupling&OVKEY=coupling&OVMTC=standard&OVADID=1478001021&OVKWID=13144988521...

Electrical Engineering: bandwidth, usable bandwidth, frequency shift
usable bandwidth, frequency shift, signal frequency: With an FM transmitter, you have a carrier frequency, for example 100 MHz. There is an input signal, for example, from a microphone. Then that 100 MHz frequency changes in response to the signal, so it goes above and below 100MHz at a rate that is proportional...

Electrical Engineering: basic circuits, transistor switch, resistor value
transistor switch, resistor value, voltage drop: Assume the transistor has a gain of 100; so the current into the base of the transistor will be collector/emitter current divided by 100. Then you can get a feel for what biasing and/or switching currents you will need at the input. Hope this solves the...

Electrical Engineering: basic spectroscopy system, square wave input, white noise generator
square wave input, white noise generator, spectroscopy system: Linearity is important in any communications channel because a non-linear function causes either distortion or wave shape alteration which, will in turn, alter the characteristics of the channel. Dead channel means that channel is not functioning. Dead...

Electrical Engineering: battery, charger systems, control circuits
charger systems, control circuits, google: There are so many battery charger systems and so many types of batteries (each requiring a different charging system) that I can only speake generally. Please refer to this good overview: http://en.wikipedia.org/wiki/Battery_charger Also, you can...

Electrical Engineering: battery chargers, gas leaks, 6v charger
gas leaks, 6v charger, charger work: You should never use a charger that was not specifically designed for the batteries being charged. That being said, if you know what you are doing and are careful you can get away with alternate chargers. The reason to be careful is that overcharging - either...

Electrical Engineering: battery charging system, volt batteries, frequency ac
volt batteries, frequency ac, copper wire: I m assuming that 30A is the max charge rate, but the normal rate should be something like 3A. 12 ga wire has a resistance of .00187 ohms/ft. That is the same for DC or low frequency AC (if it was 1MHz AC, for example, the equivalent resistance would be...

Electrical Engineering: battery packs, volt car battery, standard batteries
volt car battery, standard batteries, radio shack: Yes, that s right. You have to have the voltage right so that the device will work properly. But the current (amps) that is drawn is determined by how much current the device draws. If the battery has a higher current capability, it s OK. If the battery...

Electrical Engineering: battery wire, cell phone battery, wire battery
cell phone battery, wire battery, aa battery: The link has expired and it does not list the make/model. In any event, you still must invest in a voltmeter so you know what is going on. If the new battery has the same voltage and mah rating (or a little greater) it will work okey. But you must have...

Electrical Engineering: battery, lead acid battery, electro chemistry
lead acid battery, electro chemistry, negative plates: The electro-chemistry of the materials used require greater surface area on the negative plates. Here is a good discussion of lead-acid battery. It may answer more questions that you have: http://en.wikipedia.org/wiki/Lead-acid_battery Thank you,...

Electrical Engineering: bicycle generator, bicycle generator, correct polarity
bicycle generator, correct polarity, ampmeter: Hi, First, 1 amp is not sufficient. If you get a strong charging current it could be as much as 12 amps or more. It is easy to tell if you are getting charging current into the battery by just putting the ampmeter in the line and measuring the current...

Electrical Engineering: bicycle generator, bicycle generator, current meter
bicycle generator, current meter, battery voltage: I don t remember what your question was, but I think you were trying to charge a battery by connecting it through a diode to a bicycle generator. The diode only needs to have a voltage rating of something more than about 50 volts (1000 volts rating is not...

Electrical Engineering: a blinking light bulb, google search, conected
google search, conected, thyristor: Yes, it is very possible. Don t know if it is simple, however. There are many solutions. - IC flip-flop controlling relay of some kind. - Blinker Bulb operating a relay. - SCR or thyristor driven with blinker circuit. - UJT driven switcher. ...

Electrical Engineering: bnc/alligator clip connectors, alligator clips, alligator clip
alligator clips, alligator clip, qc lab: Yes, but it is probably neglibible. It really depends on the frequency of the testing signal, the overal inductance of the cores you are measuring and such factors. At low frequencies, say 60Hz, the inductance from the alligator clips would be very,...

Electrical Engineering: how can i bright in electrical field, core company, electrical field
core company, electrical field, software field: There are so many fields in electrical engineering. Here is what I suggest you do. It will be a good education for you and will help you come to understand the fields of technology and products. From this assignment you will not only learn the aspects...

Electrical Engineering: How do I build an eletromagnetic field?, harvester ant, compass works
harvester ant, compass works, electro magnetic field: Just so you understand the meaning of a magnet s north pole: If you take a long, thin, permanent magnet (a magnet that does not need any electricity), tie a string around the middle, and suspend it by the string, one end will point to the north of the earth....

Electrical Engineering: C, cplus, c language
cplus, c language, microcontroller: http://www.edcomp.com/search.aspx?t=0&q=c++&cmd=Search%21 http://cplus.about.com/od/beginnerctutorial/l/blcplustut.htm http://freecourse.emagister.net/freecourse-c-c++-subject-552.htm These are a few courses and tutorials that will help you get started....

Electrical Engineering: Cable Earthing & personnel safety, voltage measurement, grounding techniques
voltage measurement, grounding techniques, ground cable: If it is truly earth there would be no significant potential between the two earths. You can verify this by taking a voltage measurement at the far end after the opposite end has been earthed or grounded. There may be a vew millivolts difference, but...

Electrical Engineering: Cable presure test, cabels, voltage test
cabels, voltage test, pressure test: Depends on the context. It may refer to VOLTAGE pressure or it may refer to gas pressure. Some cables are contained with a nitrogen filled cable housing and the pressure test is to check for leaks and high impedance breakdowns. The voltage test is for...

Electrical Engineering: Calculating the duration a UPS will last., ac power sources, frequent power outages
ac power sources, frequent power outages, power disruption: Paul, I don t know in detail how to do this but I may be able to get you to a starting point. The VA rating for a power source is called Volt-Amperes . It is a measure of power because Power = Volts*Amperes. AC power sources are denoted in this way. ...

Electrical Engineering: Capacitive Touchpad, mesh grid, wire mesh
mesh grid, wire mesh, question thanks: The body has lots of liquid. The pad is not seeing only the surface of the skin but the charging of the body up through the arm. Try the touchpad with just your fingernail; won t work. Soon as the skin touches it will. The finger distorts the electric...

Electrical Engineering: Capacitor as AC voltage regulator, capacitive reactance, voltage spike
capacitive reactance, voltage spike, voltage regulators: Capacitors are not regulators , but the capacitive reactance depends on the frequency (Xc = 1/2pi F C ) At the normal 60 Hz, a capacitor may have a high reactance value, and not affect the power line. A lightning strike may cause a fast pulse with a rise...

Electrical Engineering: Capacitor and Antenna, yagi uda antenna, yagi antenna
yagi uda antenna, yagi antenna, antenna design: Energy in a Capacitor: http://hyperphysics.phy-astr.gsu.edu/hbase/electric/capeng.html Energy in electric field; then in magnetic field: http://hyperphysics.phy-astr.gsu.edu/hbase/electric/engfie.html They are really two different measurements. ...

Electrical Engineering: Capacitors, rc time constant, frequency selectivity
rc time constant, frequency selectivity, ac circuits: Sure. Caps are used all the time in ac circuits. They are the key ingredient in tuned circuits. LC and RLC combinations are used for frequency selection in every kind of radio and digital receiving device. The charging sequence in ac circuits when coupled...

Electrical Engineering: Capacitors, capacitor, dielectric
capacitor, dielectric, capacitors: You should never exceed the voltage rating on a cap. That rating is the manufacture telling you if you exceed that voltage at any time it may breakdown the dielectric and cause the cap to fail. So, your number 2 is No, No, No. HOWEVER: If you know what...

Electrical Engineering: Capacitors, vacuum tube amplifier, electrolytic capacitor
vacuum tube amplifier, electrolytic capacitor, non polarized capacitor: Yes, black is the negative lead and red is the positive lead of the polarized capacitor. Yes, you can use a non-polarized capacitor in place of the polarized electrolytic, as long as the capacitance is the same ( 0.1 uF) and voltage rating of the new part...

Electrical Engineering: Car CD Player, 2004 chevy cavalier, car cd player
2004 chevy cavalier, car cd player, chevy cavalier: Yes, I would just replace it. The mechanism is probably okey; it is the controller IC module. Repairs of this kind are generally more costly than just purchasing a new unit. www.crutchfield.com will provide you a list of models that will fit this vehicle....

Electrical Engineering: Car Schematics, lincoln town car, car schematics
lincoln town car, car schematics, amazon: I think I understand what you need. I THINK you need a schematic of the 1997 Lincoln Town Car electrical system. A Chilton s manual or Hayne s book will get you this, as well as system diagnostic procedures and repair of parts of the air conditioner system....

Electrical Engineering: Carbon brush function, motor brushes, dc equipment
motor brushes, dc equipment, power generators: And good day to you! http://www.morganite.com/what.htm http://www.maintenanceworld.com/Articles/Koenitzer/dc-motor-brushes-rotor.html http://www.alibaba.com/countrysearch/CN-suppliers/Motor_Brush.html The above sites will give you some images and...

Electrical Engineering: Career choices in electrical engineering, selecting a career, advances in medicine
selecting a career, advances in medicine, career choices: David, Questions like this are very difficult to answer especially when a young person is involved in selecting a career. Engineering has been very rewarding to me and can t see doing anything else with the same amount of reward. I think I d go nuts if...

Electrical Engineering: Career: electronics/electrical engineering, microelectronics semiconductors, ee students
microelectronics semiconductors, ee students, circuit theory: Q: Generally, what is the difference between studying electronics and electrical engineering at university? A: IT is more of a terminology usage than course description. I took the Electrical Engineering degree but it was almost no power and machinery,...

Electrical Engineering: about CBCT & Hall effect CT, control environments, industrial instrumentation
control environments, industrial instrumentation, instrumentation and control: http://www.polycastinternational.com/ See these types above; there are many possible applications. But, mostly they are used in industrial instrumentation and control environments. The fundemental action is an electric field that is sensitive to magnetic...

Electrical Engineering: CD Burner, laser diodes, google search
laser diodes, google search, laser units: http://computer.howstuffworks.com/cd-burner.htm/printable The above site will explain with pictures and text. IT is a nice qualitative description. Most burners do have two laser diodes inside the same optical drive mechanism. Please refer to the...

Electrical Engineering: CD, digital convertor, sensitive dyes
digital convertor, sensitive dyes, glass substrate: ANSWER: Wow; you really want a full engineering course in digital audio, optical recording and material science! This url is a little old, but it identifies some of the various optically sensitive dyes that are used to surface the cdr type products....

Electrical Engineering: CE amplifier, vector board, component values
vector board, component values, voltage gain: See my previous answer for component values. Lay the components out so as to connect to the transistor socket easily; Vcc and ground identified, then solder in the resistors. If you are on a vector board it is easy; if you are laying out a printed board,...

Electrical Engineering: CE amplifier, bias resistors, transistor amplifier
bias resistors, transistor amplifier, voltage gain: Do you want a voltage gain of 50? or 0.50? Actually, 0.50 is not a gain, rather it is an attenuation, meaning the signal out is 1/2 the input signal. I will give you both (for CE): Gain of 50: Collector resistor should be 47k. Emitter resistor should...

Electrical Engineering: CE, shock hazards, electrical shock
shock hazards, electrical shock, electrical noise: The letters CE stand for the french words Committee European. That is a set of regulations on electrical equipment agreed upon by an association of European Countries. Generally, any electrical device sold in Western Europe since 1994 must have this label....

Electrical Engineering: Ceiling fan motor, expid, magic smoke
expid, magic smoke, incoming power: Can t help without the make and model of the fan and the remote control system you purchased. It should have come with an instruction sheet showing where the wires all go. Colors change from manufacturer to manufacturer and application to application....

Electrical Engineering: Cell Phone EMF Hazards, cell phone users, emf protection
cell phone users, emf protection, google: All the reliable and respected investigations and studies indicate there is no hazard from cell phone use. If you are still worried about it, don t use it. Go back to hardwired telephones - which have a higher level of magnetic field than do cell phones,...

Electrical Engineering: Ceramic Fuse, amp fuse, delay type
amp fuse, delay type, agc: I m not sure that I understand your question. For a 1/8 amp fuse, you can use one rated for .125 amp. If there is only one available for .1 or .15 amps, then you can use the .15 amp fuse. (That is: next one higher, if it is not too much higher.) If you can...

Electrical Engineering: Charger for N150, wet cells, battery chemistry
wet cells, battery chemistry, type batteries: The N150 is a compaq computer? Or what? The 150ah rating is for what? One 6v battery or two of them in series to provide the 12v? Or is it the rating or 4 batteries in series for 24v output? And, what chemistry are the batteries? NiCad? NiMH? Wet Cells?...

Electrical Engineering: Charging Swuitch over, reply thanks, goodday
reply thanks, goodday, heat buildup: Can you give the battery charging specifications and the charger current ratings? That way I can make some estimate about the question you are asking. The charge rate and conditions of charge are very, very tightly tied to the characteristics of the battery...

Electrical Engineering: Chips & Circuits, clock circuits, pc board layout
clock circuits, pc board layout, will find tons: Your follow up was much more useful to me than the original. Try: http://shareme.com/details/diptrace-free.html and http://www.mitsi.com/PCB/free%20viewers.htm and http://eeshop.unl.edu/cad.html If you do a google on freeware for pc board...

Electrical Engineering: CIRCIT BREAKER, amp circuits, amp plug
amp circuits, amp plug, allexpert: I am an electrical engineer, not an electrician. You should ask an allexpert from the electrician site. But if it were me I would get a licensed electrician to wire an outlet for me. Why? 1. The two 30a outlets cannot be doubled up. 2. The house system...

Electrical Engineering: Circuit analyis, feedback resistor, initial voltage
feedback resistor, initial voltage, feedback line: Dan, The voltage gain of an op amp in the inverting configuration that you described is Vout= -Rf/Rin. Rin is the resistor going to the inverting input of the amplifier. Rf is the feedback resistor. If you input 2 volts, the output voltage will be -2volts...

Electrical Engineering: Circuit Breakers, vacuum circuit breaker, vacuum breakers
vacuum circuit breaker, vacuum breakers, circuit breakers: Vacuum breakers are used to extinguish an arc quickly when opening under load. An air filled breaker will ionize the air as the contacts separate, keeping the arc for a longer peroid of time. As the potential (voltage) between the contacts is related to...

Electrical Engineering: Circuit Design, transistor radios, design ability
transistor radios, design ability, crystal radio: I think a lot of people have this question, but it is very hard to explain. I started trying to learn electronics when I was 7 years old. I built a crystal radio about 5 times from different sets of instructions. Then I built transistor radios and transmitters...

Electrical Engineering: Circuit Question, monostable multivibrator, ee curriculum
monostable multivibrator, ee curriculum, radio shack: What you want is called a monostable multivibrator, or one-shot. You want one that is not retriggerable. This website does not have a utility for sending drawings, but you can find such a circuit in one of Radio Shack s experimenter s notebook pamphlets....

Electrical Engineering: Clock, oscillator circuit, zero volts
oscillator circuit, zero volts, logic circuits: A clock pulse generator is an oscillator circuit that has an output going from logic zero to logic one at the rated frequency. Logic zero is a voltage low enough to be considered zero volts by the logic circuit that receives it. Logic one is a voltage high...

Electrical Engineering: CMOS inverter, p channel mosfet, zero volts
p channel mosfet, zero volts, source voltage: Simon, The P channel Mosfet turns on when the gate voltage is negative with RESPECT to the source. The source voltage in the diagram you reference is connected to +5volts. When the voltage at the gate is about 3.5 volts ( -1.5 volts with respect to the...

Electrical Engineering: CMOS oscillator, bob pease, national semiconductor
bob pease, national semiconductor, lc circuit: Dave, This is only a guess but you may want to try putting a low value resistor (30-100 ohms) either across the sensor or in series with the sensor lead and the CMOS inverter. This may dampen the circuit enough to prevent the oscillation at the higher harmonic....

Electrical Engineering: COMPACT DISCS, microscopic pits, earth properties
microscopic pits, earth properties, analog to digital converter: Rare earth materials are those that are formulated and used for applying to the surface of recordable discs (they are given in the URLs of the previous reply to you). Here is a part of the text from that url: The photosensitivity of the cyanine and...

Electrical Engineering: COMPLETE discharge, going on a trip, rechargable battery
going on a trip, rechargable battery, electricity: Yes, if the battery no longer provides power, it has complete discharge . But, if you are going on a trip or for some other reason you want to get a full charge before the battery has been fully discarged, the charger can complete the discharge cycle before...

Electrical Engineering: Combining output of DC generators, automotive alternators, dc generators
automotive alternators, dc generators, output currents: Control system is electronic monitoring of the output currents and/or voltages and feedback to the field coils in the generators to bring the generators into equal output levels. They are usually custom engineered and can cost more than the generators....

Electrical Engineering: Compatibility Of Old Component with New One, efficiency unit, compatibility issue
efficiency unit, compatibility issue, replacement compressor: Technology, design and manufacturing have improved greatly over the years. In the 20 years efficiency of air conditioners and similar systems have improved dramatically; probably 50% or more. It would surprise me if the new replacement compressor would fit...

Electrical Engineering: Computer Disk Magnetics, magnetic particles, permanent magnet
magnetic particles, permanent magnet, magnetic signal: After being strongly magnetized by a permanent magnet, the magnetic grains are oriented all one way and it is outside of the capability of a normal writer to re-orient them properly. In order to reformat a disk that has been so affected, you would have to...

Electrical Engineering: Computer Engineering Degree, math and science, college engineering
math and science, college engineering, engineering degree: An engineering curriculum includes a substantial amount of math and science. If these subjects are interesting to you, then you could be a good engineering candidate. With average grades, you probably can t get into one of the highest rated universities, but...

Electrical Engineering: Conroller choose, support circuitry, logic levels
support circuitry, logic levels, luck john: Awadelrahman, There are a number of basic considerations to take into account, for instance: 1. What kind of power consumption? 2. How about voltages and logic levels. 3. Do you need a controller with many programmable I/O pins or is signal processing...

Electrical Engineering: Constant current source, constant current source, ohm resistance
constant current source, ohm resistance, resistance range: What! Do you realize that if you push 10ma through a 3Mohm resistor you must have 30,000 volts to do it? And, you would be dissipating 300 watts! I think there must be something wrong with the assumptions; this is a totally impracticle requirement. ...

Electrical Engineering: Controlling of I,V charging, internal impedance, dangerous gases
internal impedance, dangerous gases, chemical deterioration: Undercharging will just not allow the battery system to get to full charge. The power supply is designed for the specific battery being charged and the internal impedance of the supply keeps the current from rising too high. So, it is the combination of...

Electrical Engineering: Convert 230V appliance to 120V, electrical pumps, step down transformer
electrical pumps, step down transformer, rotary motor: Are these pumps driven by electric rotary motor with 230v input requirement? Have you thought of just adding a 2/1 step down transformer between the 120v line and the motor? If you are converting only a small number of units, or if you are just starting...

Electrical Engineering: Converting a 50Hz appliance to 60 Hz?, clock mechanisms, leisure rangemaster 110
clock mechanisms, leisure rangemaster 110, electronic clock: The model you mention does have a fan motor and the clock mechanisms that need 50 hz power. If you run them on 60 hz you will get the wrong time as was mentioned before and the fan motor will run faster and hotter so it is a possible endangerment. You...

Electrical Engineering: Converting Fan current into current for a Projector, electrical supply, receptacles
electrical supply, receptacles, projector: Yes, in most cases. Go to the breaker at the main panel in the house and check the current rating for that circuit. If it is 15 or 20 amps it will be okey. Be careful and make sure you know how to wire the outlet. It should be 3 wires, not two, as...

Electrical Engineering: Correct power supply required for home project?, regulator ic, radio shack
regulator ic, radio shack, dc motor: As long as the voltage rating of the power supply is correct, it doesn t matter if the current capability of the power supply is higher than needed. You could use a power supply rated for 2A, or 5A, or 10A, or even 200A. The motors only draw the amount of...

Electrical Engineering: Correctly answering a question completes the circuit, 6v battery, box lid
6v battery, box lid, science fair project: Here are some projects that come close to what you are looking for. The electronic game board could be modified to do what you are looking for. http://www.handsonprojects.org/store/ElectronicProjects.html There are others that you can google for. ...

Electrical Engineering: Course on Pneumatic Control Valve, instrumentation engineer, hvac systems
instrumentation engineer, hvac systems, pharmacy products: That is a broad field and I think you will have to narrow it down to the application area that you are thinking, such as chemical industry, pharmacy products, gas and oil, hvac systems, etc. Contact with: http://ase.tufts.edu/chemical/facGeorgakis.htm...

Electrical Engineering: CPT, valve actuators, 24v power supply
valve actuators, 24v power supply, valve position: I haven t heard of that term before, so I looked it up on the web. The term CPT is specific to a particular manufacturer, Rotork. They manufacture valve actuators. If you get the CPT option, a separate 24V power supply is added so that a signal is still...

Electrical Engineering: CRT final anode, cathode ray tube, phosphor coating
cathode ray tube, phosphor coating, phosphor screen: There is 25,000 volts on a typical tv crt. That is enough voltage to attract dust from all over the place. When a set goes into standby the filament of the picture tube is reduced to a low level just to keep in ready to heat up quickly. The temperature...

Electrical Engineering: CT meter, peak consumption, power generators
peak consumption, power generators, phase line: I don t know the answer, sorry. I understand perfectly what your dilemma is. The power company wants to feed you a balanced power on the three phases because if not that imbalance effects the system all the way back the power generators of the power company....

Electrical Engineering: CT meter, eddy currents, metallic disc
eddy currents, metallic disc, kw hours: The electromechanical induction meter (which I think you are calling a direct meter) operates by counting the revolutions of an aluminium disc which is made to rotate at a speed proportional to the power. The number of revolutions is thus proportional to the...

Electrical Engineering: CT meter, peak consumption, multiplier factor
peak consumption, multiplier factor, phase line: To get the current in each phase on a 3 phase 208VAC line when the power dissipation is 66kW and assuming equal current in each of the 3 phases: 66,000W/3 phases = 22,000W per phase. Then 22,000W/phase /208VAC= 105A. So, they are saying that the peak current...

Electrical Engineering: CT Ratio and Ammeter Selection, ammeter, amps
ammeter, amps, amp: CT ratio is the ratio of primary current to maximum secondary current under full load conditions. 150/1 means 1 amp will flow in secondary when there is 150 amps in primary side. You must have an ammeter to handle the largest current. If it does not have...

Electrical Engineering: Why Current Flow So Small Here?, voltage drop, resistor
voltage drop, resistor, leds: With your circuit, you should get about 4.3 volts to the LED circuit. If it is a red LED, it has a voltage drop of about 1.7 volts. So, there is 4.3-1.7 = 2.6 volts across the 390 ohm resistor = 6.7 mA. To increase the current, decrease the resistance. If...

Electrical Engineering: Current Limiting, constant current source, voltage stabilizer
constant current source, voltage stabilizer, watts power: A very simple way is the following: ONE: Put a small current sampling resistor in series with the output. For example, 0.1 ohm. TWO: Apply the voltage developed across that resistor and calibrate it to the current. For example, 20 amps passing through...

Electrical Engineering: Current Loop Explaination, transmitter wires, deg c
transmitter wires, deg c, current loop: There are a lot of possibilties. Are you installing a new system, or trying to understand what is already installed? What are you trying to accomplish? By receiver, I meant whatever is acting on the current loop signal (it could be an indicator or whatever...

Electrical Engineering: Current to volt convertor, slope intercept, luck john
slope intercept, luck john, opamp: First, draw the voltage vs. current graph using the two points (0v, 4mA) and (5v, 20mA). Plot the two points and draw a line through them. You get a slope-intercept line. You need to use an opamp to scale the current and voltage. The opamp will also provide...

Electrical Engineering: c.t, current transformers, magnetizing force
current transformers, magnetizing force, instrument transformer: A current transformer is an instrument transformer in which the secondary current is substantially proportional to the primary current under normal conditions of operation, and differs in phase from it by an angle which is approximately zero for an appropriate...

Electrical Engineering: cable coating, term applications, distribution lines
term applications, distribution lines, heat flow: The coatings that I am familiar with are for retarding flame spread in case of fire and for rodent and animal chewing on the line and causing short-outs. http://www.hytechsales.com/prod87.html http://www.hytechsales.com/prod88.html See the above examples...

Electrical Engineering: cables, inductance and capacitance, accurate computation
inductance and capacitance, accurate computation, cawp: There are many tools that have been developed over the years. The telephone industry and utility systems have long histories of knowing how their cables behave with faults on the line. Instruments are used that can measure resistance of a shorted wire;...

Electrical Engineering: capacitors, dc electricity, dc circuit
dc electricity, dc circuit, ac circuit: Dan, I saw your comments. You are wrong and confused about capacitors. They can be charged with dc, but in an ac motor they do not become charged. When the ac motor is turned off there is no remaining charge left on the capacitor. The capacitors are used...

Electrical Engineering: capacitors, non polarized capacitor, ohmmeter
non polarized capacitor, ohmmeter, capacitance: If a non-polarized capacitor reads a steady resistance, it is defective. If the capacitor is electrolytic, it may read a resistance in one direction of lead connection, but should count up until reading a megohm reading after a few seconds when you reverse...

Electrical Engineering: ceiling fan light wiring - seperate switches, ceiling fan light, wiring projects
ceiling fan light, wiring projects, fan combo: http://experts.about.com/q/Electrical-Wiring-Home-1734/index.htm Let me refer you to one of the experts on the above link. You will get more experienced help from them than I. They are electricians, I am an engineer with limited experience in house wiring...

Electrical Engineering: circuit board design, family radio service, radio recievers
family radio service, radio recievers, fcc requirements: Yes, getting an inexpensive receiver with a fixed frequency rather than the tunable one is easy to do. Hong Kong manufacturers make that kind of stuff. I was in walmart yesterday and they have a complete fm radio with headphones included for $1.00. ...

Electrical Engineering: circuit testing, left hand corner, resistive elements
left hand corner, resistive elements, resistive network: Most circuits; that is, for the sake of uniformity, are drawn to have a common or ground line at the bottom of the view; then all voltages are taken with reference to that. In other words, the ground or black lead of the volt meter is connected to the common/ground...

Electrical Engineering: circuit, interactive multimedia technology, google
interactive multimedia technology, google, stum: I don t have such in my collection. But you can find one by searching the internet. Use google.com and search words like electric baton schematic. Also, you can email to the Georgia Tech Interactive Multimedia Technology Center and they can help you because...

Electrical Engineering: clipping, type amplifiers, voltage swing
type amplifiers, voltage swing, circuit structure: Well, Robert, depends on the topology of the circuit. For inverting type amplifiers, the clipping will ocurr on the opposite phase of the input. For non-inverting amplifiers it will clip on the positive when a positive signal is at the input. Then, if...

Electrical Engineering: cmos technology, reactive elements, circuit paths
reactive elements, circuit paths, heat dissipation: This is the spacing between the circuit paths; hence it has a great deal to do with how dense the circuits can be etched into the substrates of the IC. The smaller the components and the closer the circuits can be interconnected the lower the lumped reactive...

Electrical Engineering: cmos technology, cmos technology, pixel size
cmos technology, pixel size, minimum space: When designing an integrated circuit, you are placing a pattern on the substrate so that semiconductors and conductor tracks can be fabricated. When making the pattern, the smallest that it can be made is determined by how narrow you can make a track, and...

Electrical Engineering: color sensor, voltage follower, variable resistance
voltage follower, variable resistance, th problem: I suggest that you start with a light detector that can sense a wide range of light frequencies, such as a CdS photosensor. You would use several photosensors, each with a different color filter in front of it. The CdS photosensor is a variable resistance,...

Electrical Engineering: comparator and the constant current source, ourworld compuserve, comparator with hysteresis
ourworld compuserve, comparator with hysteresis, constant current source: See this page: http://ourworld.compuserve.com/homepages/Bill_Bowden/page12.htm It has complete schematic and resistor values for battery charging or power supply applications. The LM317T is a wonderful device, but it is a voltage regulator, not a...

Electrical Engineering: compouter power supply question, micro atx power supply, atx power supply
micro atx power supply, atx power supply, micro atx power: I don t understand why you would be unwilling to use a 250w supply. YOu would have more than enough power. Just make sure you don t buy one with LESS than enough power. The most important thing is making sure the new supply has the same cable/connector...

Electrical Engineering: computer power supply issue, micro atx power supply, atx power supply
micro atx power supply, atx power supply, micro atx power: Brad, The power rating on a power supply indicated the maximum amount of power it can provide. Using a 250watt supply would only allow you to add more components to the computer if you want as long as you do not exceed the 250 watt rating. John ...

Electrical Engineering: conductive adhesive/epoxy, momentary switches, printed circuit board
momentary switches, printed circuit board, conductive path: In an auto store, you can buy conductive paint that is used to repair rear window heaters when they crack. First make sure that your wire has a stable mounting (solder it to a pad or epoxy it to the printed circuit board). Then paint a conductive path from...

Electrical Engineering: considering electrical engineering major, electronics engineer, electronics skills
electronics engineer, electronics skills, mechanical engineer: I think you have more opportunities when majoring in electrical engineering. Also take the courses available in other engineering curriculums to get a wider knowledge base. I majored in electrical engineering, but also took a lot of mechanical and some chemical...

Electrical Engineering: control voltage 220V AC instead of 110VAC, ptfe teflon, step down transformer
ptfe teflon, step down transformer, air conditioner compressor: That is good; the step down to 220 from 415 volts will give economies in the transformer. I hesitate to give you guidance on wiring because there are probably national or local codes that must be met for the wiring types and conditions of their layout and...

Electrical Engineering: converting amps, compressor 110v, truck battery
compressor 110v, truck battery, 12v battery: I m sorry to say that it would not be practical to design and build a power inverter (as that type of device is called) to drive that load from a 12V battery. However, if such a power inverter was built, the battery could not supply the power because...

Electrical Engineering: converting light into sound, radio shack catalog, light frequency
radio shack catalog, light frequency, mini notebook: Radio Shack catalog # 276-5015A is an Engineer s Mini-Notebook. On page 27 is shown the schematic for a transistor voice receiver and on page 29 is an AM Lightwave Receiver . They both use a phototransistor and an amplifier to drive a speaker. They both...

Electrical Engineering: converting UK plug items to US plugs, step down converter, desk lamps
step down converter, desk lamps, voltage conversion: http://www.beststuff.co.uk/voltage_conversion.htm The voltage is different in the two countries. UK is 220/240 50 Hz; USA is 115 at 60Hz. To use UK lamps in the USA you must have step down converter. When you take the lamps back to the UK, just omitt...

Electrical Engineering: creating three phase power from a solid state device, rc time constants, volt supply
rc time constants, volt supply, milling machine: The two legs you have are at 180 degrees. Three phase lines have 120 degree separation. There are converters available to generate three phases from one, but the cost is not very practical. If you made your own generator, the high current controls are very...

Electrical Engineering: Too much current drawn, voltage drop., lever arm, servomotor
lever arm, servomotor, servo motor: Yes. The current requirement is, in the most part, a function of the loading on the shaft of the motor. Can you reduce the load? What it is driving? Can you gear it down or remove some of the friction or momentum or drag or change the lever arm or such that...

Electrical Engineering: Too much current drawn, voltage drop., value capacitor, servo controller
value capacitor, servo controller, servo motor: Steve, I don t recommend that you limit the current to the motor. The torque produced by the motor is directly related to the amount of current. High current is needed to respond rapidly to the commands to the servo controller. The best solution is to use...

Electrical Engineering: current shunts, shunt resistor, shunt resistance
shunt resistor, shunt resistance, power management systems: I presume you have already searched on google.com for shunt theory and found there are many entries and many manufacturers of instruments and shunts. In its most basic principle, a current shunt is a very low value resistor that is placed in the circuit...

Electrical Engineering: If the current throuth a resister..., orange gold, orange orange
orange gold, orange orange, colour bands: Orange, orange, gold, gold, means the resistance is 0.33 ohms, with a 5% tolerance. To find the voltage, multiply the current by the resistance. Increasing the voltage by 5.2 times would be achieved by increasing the current by 5.2 times. I can t give...

Electrical Engineering: current to volt, ohm resister, laboratory assignment
ohm resister, laboratory assignment, ohms: Oh, you want a working unit; not just a laboratory assignment to complete! I will give you two solutions: ONE: Put in a PC and program it so that it detects the it converts the 1v to 6v down to 0v - 5v. (With your 250 ohm resistor). TWO: You can...

Electrical Engineering: current to volt, resistive divider, difference amplifier
resistive divider, difference amplifier, electrical engineering faculty: If you had exactly 24 volts, then you could use a voltage divider from 24V, and an op amp to buffer it, to get your 1.25V. (You would need the op amp because without it the voltage would change anytime the load changed). The problem is that the 24 volts is...

Electrical Engineering: A/D CONVERTERS, dual slope analog to digital converter, analog to digital converter
dual slope analog to digital converter, analog to digital converter, digital voltmeter: A DS A/D converter uses an integrator with a voltage output that ramps up at a rate proportional to the input signal voltage, with a counter counting up until it reaches max count. Then the counter is reset and the integrator ramps down at a fixed rate. The...

Electrical Engineering: A?D converters, dual slope analog to digital converter, analog to digital converter
dual slope analog to digital converter, analog to digital converter, digital voltmeter: http://www.allaboutcircuits.com/vol_4/chpt_13/8.html Take a look at the site above. It will explain it pretty well, I think. humanresources.web.cern.ch/humanresources/ external/training/tech/special/FEED2002/FEED-2002_17Sep02_2.ppt The above site...

Electrical Engineering: Dangers and measurement of electricity, magnet field, 60 hertz
magnet field, 60 hertz, underwriters laboratories: I know that 24 volts is considered safe for skin contact, but I don t know what voltage causes enough current to flow to result in damage or death. You should be able to find something on the UL site (underwriters laboratories). A voltmeter, one that has...

Electrical Engineering: Data aquesition, recieving station, hardware interface
recieving station, hardware interface, envirment: I am not expert with labview modeling system. http://zone.ni.com/devzone/cda/tut/p/id/4566 The above may guide you through some approaches to your sought after solution. Here is tutorial level description of labview environment. http://en.wikipedia.org/wiki/LabVIEW...

Electrical Engineering: DC to AC Inverters, customer service reps, dc to ac inverters
customer service reps, dc to ac inverters, sam sam: Sam, If you are in the United States, we run of of 120 VAC. So all of the equipment is designed for this voltage. Just keep in mind the power requirements. Speak to one of the customer service reps when you go to look at converters. They should be able...

Electrical Engineering: DC Control relays, dc contactor, gauge wire
dc contactor, gauge wire, ir drop: In my opinion 10k feet is not a long distance. If the relay to be operated is a normal type of relay and there is no critical make before break sequence involved in the system you should be okey. The capacitance or inductance of a line that long is small...

Electrical Engineering: DC circuit adding, watt light bulbs, ac generators
watt light bulbs, ac generators, electric conversion: Yes, two generator electrical output can be combined and the total power is the sum of them. HOWEVER: If the generators are DC type the outputs must be similar in voltage. In other words, both pedalers must pedal at about the same rpm level. If they are...

Electrical Engineering: DC Generator excitation, dc generators, diode bridge
dc generators, diode bridge, initial voltage: If a generator is the type that does not use permanent magnets, then it has a field winding to produce the required magnetic field. (The same is true with an alternator that has a diode bridge on the output in order to form DC.) This field winding always...

Electrical Engineering: DC generator, reverse polarity, dc generator
reverse polarity, dc generator, permanent magnet: The stator - which means stationary - is usually thought of as remaining in a fixed position while the rotor - which means to rotate - is rotated one direction or another. Reversing rotation of the rotor (armature) will reverse polarity of the current flow....

Electrical Engineering: DC generator, steam turbine, steam engine
steam turbine, steam engine, dc generator: You will probably run it at a constant speed to keep the ripple low, and you will probably run a constant magnetic field, to keep the voltage constant. So that means that you have to design the generator for the highest current that will be needed. When less...

Electrical Engineering: DC generator output at variable RPM, ohm resistor, ohm load
ohm resistor, ohm load, wind turbine: Resistive load would be in ohms. Is the load a 10 ohm resistor? (E = I*R, or R = E/I = 3v/.3a = 10 ohms) If the load is a fixed resistor, then increasing the rotational speed will increase the voltage (and the power) output and decreasing the speed will...

Electrical Engineering: DC generator output vs. armature speed, resistance load, dc generator
resistance load, dc generator, electrical engineer: I read your feedback. Thanks. Actually, I don t believe there is a votlage regulator in the 33 dodge - for this reason: If the voltage is allowed to continue to increase as the rpm increases it will over charge the battery and damage it. Actually, the...

Electrical Engineering: DC generator, voltage regulator circuit, dc generators
voltage regulator circuit, dc generators, ac generators: SSG Deer, You are right on both accounts! Because it depends on how the generator is wired by the manufacturer. It is correct the excitation field must have current in it at all times, but where that current comes from is not so important. Most dc...

Electrical Engineering: DC MACHINE, principle of dc motor, dcmotor
principle of dc motor, dcmotor, dc machine: Magnetic fields and forces created by coils of wires inside the magnetic field. See http://www.solarbotics.net/starting/200111_dcmotor/200111_dcmotor2.html http://www.howstuffworks.com/motor.htm for motors and: http://www.tpub.com/content/doe/h1011v2/css/h1011v2_84.htm...

Electrical Engineering: DC Motor, bridge rectifier, marine electrician
bridge rectifier, marine electrician, filter capacitor: Not sure of your question: You state that the problem is with the switching relays that have prematurely failed. But your question is about the windlass motor, if I get the jist of your statement. So, let me comment both ways. ONE: The switching relays...

Electrical Engineering: DC motor controller, dc motor controller, transient suppression
dc motor controller, transient suppression, dc contactor: Well, I know diodes work on small fractional and upto 10 HP, but a 50 HP motor is another matter. I suppose a diode would work, but it may be difficult to find one and I don t know how to specify it. The transient kickback could be quite huge. I did a...

Electrical Engineering: DC neg side wire colors, wire colors, dc wiring
wire colors, dc wiring, luck john: John, Your question does seem to be a bit ambiguous but I THINK I understand. It seems that you are switching the negative DC voltage because you said that the w/blue striped (-DC) wire is connected to one side of the relay contacts. That indicates to...

Electrical Engineering: Dear sir;I intend to make..., proccesor, z 80
proccesor, z 80, private project: There are many hobby and circuits magazines and websites that can help you with this kind of project. http://www.epanorama.net/links/motorcontrol.html#servo is a good site for several servo circuits and diagrams, for example - which I found by one simple...

Electrical Engineering: Delta system phase to ground voltage, dynamic load test, volt motor
dynamic load test, volt motor, delta system: That is important. If identical motors measure differently from each other that is a sign of some imbalance for sure. http://www.answers.com/topic/three-phase-electric-power The above site, by the way, has some very good diagrams on 2 phase operation....

Electrical Engineering: Delta-Wye transformer, ground reference, phase transformer
ground reference, phase transformer, hot wire: A transformer is, in the ideal, transparent to the ac system. For example, a load on the secondary of a transformer is seen as an equivelant load on the generator. Likewise, the load sees back through the transformer to the generator as though the transformer...

Electrical Engineering: Dielectric Constant, capacitance value, dielectric constants
capacitance value, dielectric constants, allaboutcircuits: ANSWER: From: http://www.allaboutcircuits.com/vol_1/chpt_13/3.html I quote: DIELECTRIC MATERIAL: All other factors being equal, greater permittivity of the dielectric gives greater capacitance; less permittivity of the dielectric gives less capacitance....

Electrical Engineering: Diesel engine cranking using battery, engineering design team, system functionality
engineering design team, system functionality, battery energy: This is an application specific question. It really depends on the design of the system functionality of that manufacturer of the machinery. It would seem logical the starting of the systems could be overriden by the operator to start either way at any time,...

Electrical Engineering: Difference b/w 8086 & 8088, intel microprocessor, intel intel
intel microprocessor, intel intel, logical level: Try this site (The first one works, but it requires some special software to view it, I think): http://homepages.wmich.edu/~bazuinb/ECE357/H&J_Ch07.pdf The above is a pdf of the same set of slides all about these two micros. The registration is off,...

Electrical Engineering: Difference b/w 8086 & 8088, intel microprocessor, personal computer pc
intel microprocessor, personal computer pc, telephone cables: The 8086 was intended for use in a personal computer (PC). The next in the series for PCs was the 80286, then the 80386, 80486, then the Pentium. There are other markets for microprocessors. The 8088 was not in the series for PC use, but was used for industrial...

Electrical Engineering: Digital amplification, digital signal level, digital amplification
digital signal level, digital amplification, transistor circuit: Ben, Generally, a signal, digital or analog may be amplified using an OP AMP. Depending on the digital signal level of interest, you may also use an open collector transistor circuit (this may cause and inversion of the signal), a comparator circuit or a...

Electrical Engineering: Digital art table advice, rear projection television, electrician engineer
rear projection television, electrician engineer, broadcast designer: Good Project. Will keep you up nights for a long time. (BTW: The arc/color bowing problem you mention is typical of convergence failure and requires an expensive repair IF you are going to retain the scanning system and raster type display that is used in...

Electrical Engineering: Digital Circuit, logic families, logic analyzer
logic families, logic analyzer, logic products: Yes, and No. A logic analyzer has many built in patterns and also has a learning ability to look at standard patterns and try to analyze it. There are several standard logic families that are built into the typical analyzer. Some more advanced analyzers...

Electrical Engineering: Diode, passive devices, resistors
passive devices, resistors, capacitors: Generally, resistors, capacitors, inductors, transformers and such are classified as passive devices. Devices that have a of p-n junction or an active region such as transistors, diodes, MOSFETS and such are classified as active devices. Active devices...

Electrical Engineering: Diode For Generator, silicon diode, forward bias
silicon diode, forward bias, voltage bias: Silicon diode junctions go into forward bias at around 0.6 to 0.7 volts. If you look at the Voltage vs Current transfer characteristics it has a rounded knee, so it does not switch exactly, but over a small range of a couple of tenths of a volt. Big application...

Electrical Engineering: Diode Question, power fet, voltage spike
power fet, voltage spike, designing a product: It should be rated for 60 volts or higher. The reason that it is so much higher than 12 volts is because volatge spikes can sometimes occur when the circuit is opened. And a voltage spike greater than the rated reverse voltage of the diode could damage it....

Electrical Engineering: Diode, germanium diode, crystal radio
germanium diode, crystal radio, forward voltage: If it is a two-leaded device with a line at one end, the line always indicates the cathode. There must be a mistake in the directions. Any germanium diode would do, except that I would not use a large power device because it would have excessive capacitance....

Electrical Engineering: Diodes, piv, diode
piv, diode: to place them in series is very tricky. they each have different characteristics and don t share the voltage equally. they would need to be matched and derated by 50 percent. so, it is better to find a diode that is rated properly. 1N means it is a diode....

Electrical Engineering: RTD, resistance value, control circuits
resistance value, control circuits, conversion table: There are many types, kinds and brands of such resistive devices. Could you be a little more specific? Give me a make, or model or product description. There are those that are complete stand-alone devices with electronic control circuits and those that...

Electrical Engineering: Dish arial, dish antenna, layers of the atmosphere
dish antenna, layers of the atmosphere, microwave range: The signals from satellites are in the microwave range, with periods of only a few centimeters. So, a dipole, etc. type of antenna would only be an inch or two long. With such a small size, the sensitivity would be very low. With a dish antenna, all of the...

Electrical Engineering: Driving Impedance, transistor circuits, output impedance
transistor circuits, output impedance, input impedance: I would not use a term such as driving impedance without explaining it. I suppose that they are talking about the output impedance of the amplifier. The impedances are not simple resistors. They are transistor circuits with gain, and the impedance is...

Electrical Engineering: DSP Questions, dsp questions, computer algorithm
dsp questions, computer algorithm, sequence x: A good discussion of DFT solutions and strategies as referred to in the book described in http://www.dspguide.com/toclong.htm You need the help of a college professor who lives and breathes in these languages! I can refer you to a couple of them if you...

Electrical Engineering: Dual SLOPE (A/D) Converter, dual slope analog to digital converter, analog to digital converter
dual slope analog to digital converter, analog to digital converter, digital voltmeter: I can t say I m an expert on this topic. I can refer you to a web pages which describe dual slope A/D converters which may guide you with your question. General ideas about Dual Slope A/D Capacitor charged with a current proportional to the input during...

Electrical Engineering: Duplex Coil, wheatstone bridge circuit, chip device
wheatstone bridge circuit, chip device, nulls: Actually, you have it wrong. The duplex you are speaking of is to allow the conversation to take place on the same line in both directions. The telephone systems have amplifiers in the lines that amplify in both directions so that your signal can go the...

Electrical Engineering: d.c motor,generator and a.c motor, generator, google search, motor generator
google search, motor generator, c generator: Do you have a question? Motors and generators come in many, many sizes, shapes and designs. They are used in everything from microminiature subsystems to large power systems. They range is size from a few micrograms to thousands of Kgrams. Please refer...

Electrical Engineering: a dark switch, variable resistor, hystersis
variable resistor, hystersis, hysterisis: The most simple way is a relay. When the light comes on it flips the relay; indicators go off or on depending on how you wired up the relay contacts. If you obtain a relay that is spdt (single pole double throw) it can be used either way for lights on or...

Electrical Engineering: data transfering, dedicated system, flopy drive
dedicated system, flopy drive, dos machine: At the bottom of this page http://www.intproducts.com/industrial.html you will find a FAT data file support. Perhaps such software will allow you to take the data from the HD DOS machine (which is a FAT file) and prepare it for reading in a PC. Then,...

Electrical Engineering: data transfering, dedicated system, flopy drive
dedicated system, flopy drive, luck john: If you know the name of the program you want to copy, do this: 1. Install hard drive to new system and give it a drive letter. Now you have a system with two hard drives. Make sure that the new system does not want to boot from the hard drive that you...

Electrical Engineering: dc generator, shaft speed, dc generator
shaft speed, dc generator, hand crank: But running at constant speed is a construct of the explanation of the system. If the shaft is running at constant speed it means the mechanical/rotational work input to the shaft must vary as required to keep a constant rotational speed. The purpose of...

Electrical Engineering: dc machine, motor generators, dc generators
motor generators, dc generators, external electronics: Yes, and no. Depends so much on their construction and purpose. There are some that are designed and manufactured for that purpose; example, the motor/generators in hybrid cars. To do double duty and still make them efficient requires expensive designs...

Electrical Engineering: dc motor failure, bearing housings, metal housings
bearing housings, metal housings, electrical machinery: Yes, I have, but I am not a deeply experienced electrical machinery person. The damage that I have seen similar to what you have described was when the bearing and bearing housings were worn from lack of lubrication and the entire rotor began to wobble within...

Electrical Engineering: dc motor and generator, exact conditions, ac supply
exact conditions, ac supply, dc motor: Some to; some don t. It depends so much on the way the windings are built and the relation of the coils with each other. Some of them will run, but slowly and unreliably with very little torque power. Others will wiggle the shaft but will not turn. Some...

Electrical Engineering: dc motor, back emf, armature
back emf, armature, dc motor: 220 volts / 15 amps is 14.6 ohms. You subtract the armature resistance from this, because this does develop motor power, to get 12,567 ohms. Then 15 amps x 12.567 ohms = a back EMF of 188.5 volts. Use the 12.567 ohms when calculating power. Hope this...

Electrical Engineering: degital desplay, liquid level measurement, analog to digital converter
liquid level measurement, analog to digital converter, liquid changes: You will need an analog to digital converter with 8 bit resolution. See http://en.wikipedia.org/wiki/Analog_to_digital_converter for a discussion about this. You should be able to find such in a local electronic parts store such as Radio Shack. ...

Electrical Engineering: degital desply, liquid level measurement, analog to digital converter
liquid level measurement, analog to digital converter, liquid changes: Rizwan, First you need a Analog-to-Digital converter to convert the 0-5v analog to a digital signal. Then you need to scale the output of the ADC to match the 0-5v to 0 to 250. If you get an ADC that has a 0 to 5 volt input you can scale the ADC output...

Electrical Engineering: design between tow generators, genarac, change over switch
genarac, change over switch, distribution board: Caterpillar, Cummins and Genarac are the big makers of switch gear for medium sized generators. I refer you to their web pages: http://www.cat.com/cda/layout?m=82160&x=7 http://www.cumminspower.com/powergenerationproducts/switchgearcontrols/home.jhtml...

Electrical Engineering: How to determine Voltage Fluctuation, voltage fluctuation, voltage fluctuations
voltage fluctuation, voltage fluctuations, mosfet amplifier: A peak detector will detect only all positive peaks or all negative peaks, depending on which way it is applied to the circuit. If a bridge peak detector is used it can detect both positive and negative peaks. In the case of a 60 Hz line feed, it is only...

Electrical Engineering: How to determine voltage fluctuations, voltage fluctuations, voltage fluctuation
voltage fluctuations, voltage fluctuation, electronics kits: I can t say I am an expert in this kind of design (I typically specify a commerical device that does this and interface with it) but you might look at this site: http://www.eidusa.com/Electronics_Kits_Voltage_Monitoring.htm There is a schematic shown...

Electrical Engineering: dictionary, computer science background, digital dictionary
computer science background, digital dictionary, trivial project: This is no trivial project. First, you must decide many system requirements. Such as: How big will data file be? (How many words and definitions) How to enter data? How to update data? How many bits per definition allowable? How big is display?...

Electrical Engineering: dictionary, computer science skills, computer science background
computer science skills, computer science background, digital dictionary: Meera, The project that you speak of is very large especially since you have very little, if none, electronics background. One of the problems is the time that it would take for you to learn what is necessary in order for you to build the gadget . If this...

Electrical Engineering: differential signal, differential amplifier circuit, differential signal
differential amplifier circuit, differential signal, noise immunity: A typical single ended signal could be with two wires, where one has a voltage of either 0V or 5V, and the other wire is 0V (ground). With a differential signal, there would be two wires, when one, for example, goes from 0V to 5V, the other goes from 5V to...

Electrical Engineering: digital disply, liquid level measurement, digital panel meter
liquid level measurement, digital panel meter, voltage divider: The simplest way would be to buy a digital panel meter. You can get one from digikey.com for less than $40. Otherwise, you ll need to make the same thing yourself. If you want to build one, you can use the Intersil part number 7107. It comes with an application...

Electrical Engineering: dual-slope integrating ADC, dual slope, clock period
dual slope, clock period, variable period: The digital output is based on T2/T1 * Vref. When T2 is very small, then the input reading it represents is much smaller than Vref. I ve seen some very good explanations in the past from the manufacturers of ADCs. Try looking up an application note for...

Electrical Engineering: Earth Fault, cutler hammer, earth fault
cutler hammer, earth fault, control circuitry: A certain ground fault can cause current to flow to ground which would cause the system to think there is a current imbalance and produce the alarm. One would need to analyze the specific control circuitry to determine the exact circuit action. But, earth...

Electrical Engineering: Earth and Neutral incorrectly wired - dangers, phy, volts
phy, volts, faults: It would depend on what kind of system and what loads were on the line. In most cases, with everything working as normal as it should and no excessive loads, shorts or faults on the line you would probably not notice any difference. For danger; it could...

Electrical Engineering: Earth and static electricity, van de graaf, static electricity
van de graaf, static electricity, ground current: You are confusing current flow and closed circuit paths with the concept of just moving charges around from place to place. The electrostatic charges you mentioned are just bundles of electrons that get moved or arced from one object to another, sort of....

Electrical Engineering: Earthing Clamp, bolt and nuts, dissimilar metals
bolt and nuts, dissimilar metals, characteristic changes: Electrical connections, especially where high currents are involved, must be very, very low impedance. There are chemical reactions between dissimilar metals, micro-corrosion and a multitude of physical things that can alter the resistance and inductance of...

Electrical Engineering: Earthing and System Grounding suitable for Telecomm Equipment, telecom equipment, enabling technologies
telecom equipment, enabling technologies, safety rules: I can tell you it is important and must be done in accordance with safety rules and any government codes for your area. But the specific details should be coming from the manufacturer of the equipment. Please contact with them directly. http://ceenews.com/mag/electric_grounding_bonding_telecommunications/...

Electrical Engineering: ECM Motors, regal beloit, ecm motor
regal beloit, ecm motor, electrical engineer: In your rating, you mentioned that you could not ask a follow up question. Unfortunately, there is a limit to how many questions I can answer per day and still have enough time to do my normal job, and I m sorry about that. When the daily limit is reached,...

Electrical Engineering: ECM motor feasability for constant volume fan coil, ecm motor, room thermostat
ecm motor, room thermostat, volume fan: Look at this page: http://www.nailor.com/pdf/ECM_1.pdf And, http://www.pureairsystems.com/go/pure-air-university/301-research I cannot add anything to the comments above. I think it answers your question precisely. But, if you have more detailed...

Electrical Engineering: Echos, cell structure, distances
cell structure, distances, reflection: I am not steve.......... Echo on mobile and cell phones can be electronic as well as from reflection. Sometimes in the cell structure two cells will be delivering you the same message - from a different distance. It happens when there is not a clear...

Electrical Engineering: EE graduate school, barry vercoe, audio engineering society
barry vercoe, audio engineering society, ken pohlmann: The only one that I know of is Georgia Tech in Atlanta. Professor Marshall Leach is a professor there and he taught some good courses on amplifier design a few years ago. You can reach him by email. Go to the GT web sites and there is a faculty roster with...

Electrical Engineering: Effect of Temperature on Battery Lifespan, battery lifespan, ups system
battery lifespan, ups system, storage limits: Heat or high temperature is never good for anything electrical or electronic. The higher the temperature the shorter the life span of the product. In the case of sealed wet-cell batteries there are temperature operating and storage limits. If you pull up...

Electrical Engineering: ELD +TV color, google search, information density
google search, information density, alternate frame: 1:100 is the ratio; there may be 10 primary and 1,000 secondary; depends on the necessary electrical characteristics being engineered into the transformer. For example, more turns gives tighter coupling and more efficient transfer of energy; but it also adds...

Electrical Engineering: ELECTRIC, tanks a lot, pipe diameter
tanks a lot, pipe diameter, diameter pipe: I don t know what you mean by a Font . If you use water as an analogy, voltage is like the water pressure (for example, in pounds per square inch), and current is like the water flow (for example, in gallons per minute). A higher resistance in a conductor...

Electrical Engineering: ELECTRICAL EARTH PIT FOR HV TESTING LABORATORY UPTO 300 KV, msha gov, kv voltage
msha gov, kv voltage, earth resistance: Earth conditions are important and depending on soil and structure of ground plane it will influence the design. See: http://www.vimalchemical.com/Products.htm for a brief explanation and ways to enhance conduction. This is a nice discussion on ...

Electrical Engineering: ELECTRICAL ENGINEERING QSN, demand meter, leg times
demand meter, leg times, maximum demand: According to my calculation the power being delivered is about 45kva well over the 30kva demand. (Note the power of each leg is the voltage of the leg times current in the leg, not the voltage phase to phase.) Power factor was estimated. Better check...

Electrical Engineering: ELECTRICAL, circuit breakers, rccb
circuit breakers, rccb, menu services: http://www.hagerbr.com.au/menu/services/frequently-asked-questions/800-84.htm I do not know much about the details of these circuit breakers. But, the web page above has detailed answers to many questions relating to the two types of devices. Sorry,...

Electrical Engineering: Electirc Thermos?, electric thermos, vacuum flask
electric thermos, vacuum flask, thermos bottle: http://www.monotsukuri.net/japan/mimamori/mimamori.htm The above site is tranlated from Japanese; it explains how an electric thermos is used for aged parents who are distant from their children or caregiver. That is one electric or electronic thermos...

Electrical Engineering: Electric Current, electro motive force, source impedance
electro motive force, source impedance, motor mechanics: Roger, When you turn off a motor driven appliance the motor becomes in effect, a generator. When the source of power is removed, angular momentum of the motor mechanics causes the shaft to continue to rotate. This energy causes a reverse electro-motive...

Electrical Engineering: Electric current flow, metal ruler, resistance path
metal ruler, resistance path, resistance value: The lowest resistance path on the metal scale would be directly between the electrodes, so some current would flow along that path. In addition, all other paths between the electrodes will act as parallel resistances, and some smaller amounts of current will...

Electrical Engineering: Electric field difference, resistors in series, narrow pipe
resistors in series, narrow pipe, eminates: What? No, there is no meaningful electric field around the terminal or the resistors. I think you are confused between voltage (emf) and electric field theory. Electric fields are present for sure, but they have nothing to do with current flow in this example....

Electrical Engineering: Electric Generator, george westinghouse, westinghouse electric
george westinghouse, westinghouse electric, nicoli: My guess is the only way would be: 1. From the Westinghouse archives. You must reach them by going direct to their technical department - somewhere! 2. From some user who still has one in operation and has kept the documentation on file. Don t ask...

Electrical Engineering: Electric Motor simulation., 3 phase motor, conventional induction
3 phase motor, conventional induction, squirrel cage: This site has some good ideas for what you are doing: http://www.eetasia.com/ART_8800373705_1034362_617c924a200506.HTM Here is on that is very detailed for a squirrel cage design motor: http://www.ece.eps.hw.ac.uk/Modules/B33gn1/JHi_Three%20Phase%20Induction%20Motor.pdf...

Electrical Engineering: Electric motor rotation, alfredo alamo, shredder machine
alfredo alamo, shredder machine, paper shredder: But the paper shredder has a make and model? Then we can look it up. You must go back to the shredder and determine how it was connected and what the gear changes were when the reverse switch engaged. I think you will find there is a gear box in the shredder....

Electrical Engineering: Electric motors, continuous duty cycle, vehicle estimates
continuous duty cycle, vehicle estimates, combustion engine: Yes, this is out of my direct area; but an interesting question. It is one that I would delve into if I had the time to do so as we would both gain a lot of knowledge. There are some quantitative hurdles to go through to calculate the power requirements...

Electrical Engineering: Electric to outside shed, voltage drop calculator, max amps
voltage drop calculator, max amps, boat battery: Well, according to the NEC, you re good on a #10 off of a 15A breaker, so the breaker is the limiting factor here. Don t worry about your loads or the voltage drop. Your battery charger would only pull that maximum for a short period of time, not enough to...

Electrical Engineering: Electric shock, electric shock, resistances
electric shock, resistances, ohm: If the person is positioned, as I suspect is the case in your example, so that all of the resistances are in series, then you add up all of the resistances to get the total resistance. The 50 volts appears across the total resistance. Divide the voltage (50V)...

Electrical Engineering: Electric tools, electric tools, northern tool
electric tools, northern tool, multimeter: It s called a clamp-on multimeter. You can get one for $99 at Northern Tool: http://www.northerntool.com/webapp/wcs/stores/servlet/product_6970_200317742_200317742 The only catch is that if both the hot and neutral wires pass through the clamp, they cancel...

Electrical Engineering: Electric tools, current probe, digikey
current probe, digikey, luck john: Ted, You can probably pick something up at Radio Shack. Actually, the device is called a Clamp-on AC current probe. On the net, try jameco as well as Digikey . When you get to their webpage type in AC current probe. This should get you started. Good...

Electrical Engineering: Electrical, electromagnetic compliance, tesla coils
electromagnetic compliance, tesla coils, static electricity: James, I don t think I m going to be much help on this one. I can t even begin to imagine what this could be. The devices that come to mind are something called a Van De Graffe generator and /or Tesla coils. Devices like this are used to generate high...

Electrical Engineering: Electrical, insulation resistance, megohmmeter
insulation resistance, megohmmeter, test voltages: megging is done by using a megohm-meter (also called a megger), in order to test insulation resistance between two conductors. The megohmmeter usually operates at 500VDC, but some models allow the user to select from several test voltages. By measuring...

Electrical Engineering: Electrical(9v wire connection to AAA connection)?, regulator circuit, electronic circuits
regulator circuit, electronic circuits, integrated circuits: No. The radio needs 9 volts, but one triple A cell has only 1.5 volts. You would need to follow my earlier instructions, but with a switching regulator circuit to convert 1.5 volts up to 9 volts. It s fairly complicated to do. Hope this helps! Dav...

Electrical Engineering: Electrical Adapters, rv power cords, rv place
rv power cords, rv place, amp service: I am not sure what you mean, but if you are wanting to put adapters back to back I do not recommend it. Adaptors like to see very resistive loads or shallow power factors. The input to another adaptor is too reactive and will cause fuse blow outs and potential...

Electrical Engineering: Electrical Advice, electronics textbooks, electrical advice
electronics textbooks, electrical advice, circuit model: Raafat, You need to find the resistance per meter of the particular cable you are using. Then it is a matter of constructing a circuit model on paper and calculating the voltage drop across the cable. There are tables in electronics textbooks that address...

Electrical Engineering: Electrical Appliances Conversion, electric razors, electric mixers
electric razors, electric mixers, curling irons: Bad news: Simple devices can be operated with an inexpensive converter from Radio shack that includes a power diode. These include curling irons, some electric razors, and such devices that are relatively low power and not relying on the line frequency or...

Electrical Engineering: Electrical Cables, electrical cables, interference problems
electrical cables, interference problems, cables audio: Unless their are very long runs (hundreds or thousands or feet) it makes no difference to the electrical performance. The ties have one disadvantage; bundling power lines close to other cables (audio or video) can induce hum or other interference problems....

Electrical Engineering: Electrical cable sizing, electrical cable sizing, hobby greenhouse
electrical cable sizing, hobby greenhouse, gauge wire: 10 gauge would be best. The problem with lower gauge wire is you get voltage drop across it and when the heater goes on, for example, the lights will dim unduly. Also, there are electrical codes for your city or state that you can consult; some towns will...

Electrical Engineering: Electrical conductivity, web support staff, electrical conductivity
web support staff, electrical conductivity, conduct electricity: I have difficulty myself in finding detailed information on lead oxide. The best page on line I found is: http://www.scescape.net/~woods/elements/lead.html However, it doesn t seem to be specific to lead oxide. This may require a visit to your local...

Electrical Engineering: Electrical conductor properties, electrical conductor, phase transformer
electrical conductor, phase transformer, meter base: If this is a straight 3-phase connection with no neutral being brought into the service (480V versus 480/277V or 208V vs. 208/120V) then if that other conductor is actually grounded, you need to find the ground connection on the meter base. But you usually...

Electrical Engineering: Electrical conversion, electric shock hazard, ground fault detection
electric shock hazard, ground fault detection, ground fault interruptor: I do not recommend what you are proposing. A hot tub needs special care to prevent a possible electric shock hazard. If you change the grounding configuration, the ground fault interruptor circuit may not work properly. Also, the heaters will work on...

Electrical Engineering: Electrical and Electronics, permanent magnet generators, inductive reactance
permanent magnet generators, inductive reactance, ourworld compuserve: Calculate the inductive reactance of the inductance. (Xl = 2pifL). Capacitance must equal same reactance. (Xc = 1/2pifC and solve for the value of C. Here is a calculator: http://ourworld.compuserve.com/homepages/Bill_Bowden/XLC.htm Hope this helps....

Electrical Engineering: Electrical Engineering, calculus and analytic geometry, audio engineering society
calculus and analytic geometry, audio engineering society, ncta cable: There is great demand for electrical engineers of all kinds. It is an outstanding career choice. There are many, great and varied opportunities in many industries and fields. From patent law to corporate management, R&D, research labs, engineering design...

Electrical Engineering: Electrical Engineering, conductor cables, shield armor
conductor cables, shield armor, hz signal: It depends entirely upon the application. One Belden site had this to say (about 60 Hz isolation): Product FAQ Shielding 60Hz cables -------------------------------------------------------------------------------- There is no effective shield...

Electrical Engineering: Electrical interference, electrical interference, rf fields
electrical interference, rf fields, static sound: Try moving it into other positions or orientations, but appliances of this kind that put out rf fields are hard to contain. You can try putting on a suppressor which you can get at places like Radio Shack (it plugs into the wall outlet and the cord of the...

Electrical Engineering: Electrical Motor, electrical motor, lost one
electrical motor, lost one, geometry: Yes, most of them will run; not at full load and not very efficiently, but under no load conditions they may run okey. Some of them may not get started but only buzz with on phase, but if manually turned they may start running. It will depend a great...

Electrical Engineering: Electrical Panelboards, schneider electric, panelboards
schneider electric, panelboards, volts: This document will explain the basics: http://www.schneider-electric.ca/www/en/products/mcc/8998CT9701.pdf NQOD are for 240 volts or lower and are for single phase panel wiring. NEHB is used for 480 volts, 3 phase panel wiring. Hope this helps,...

Electrical Engineering: Electrical Resistance Tomography, electrical resistance, hwr
electrical resistance, hwr, electrolyte: Maybe these images will give you some ideas of the current distribution within the electrolyte. http://tian.hwr.arizona.edu/yeh/research.html#chino I don t know about when there are different phases! It may be a subject of research by those involved...

Electrical Engineering: Electrical Supply System, horsepower motors, heat losses
horsepower motors, heat losses, optimum efficiency: Single phase is convenient for delivery of power to simple and common appliances and apparatus in the home and office. Large machines that do heavy work, such as multi-horsepower motors used to drive big machines, require optimum efficiency not only for...

Electrical Engineering: Electrical Terms, john wiley sons, position sensors
john wiley sons, position sensors, electrical resistance: Sure! If you have a pump, pumping water through a length of pipe, the current is like the flowrate, e.g. in gallons per second. This is like current flowing through a wire in coulombs per second. A coulomb is the amount of electrons that flow in one second...

Electrical Engineering: Electrical Transformer, nearby conductor, volt amps
nearby conductor, volt amps, faraday effect: A changing magnetic field induces energy into a nearby conductor, this is called the Faraday effect. If the magnetic field is constant, as produced by a DC current in a coil, there is no energy induced into a nearby conductor. That s why transformers don t...

Electrical Engineering: Electrical, ac synchronous motor, hz frequency
ac synchronous motor, hz frequency, power frequency: Bill, does this light use AC or DC for power. That is, do you plug it into the wall? You must also know if the motor is an AC synchronous motor. If so, and the motor uses the 60 HZ frequency coming from a wall outlet, you probably CAN NOT change the speed...

Electrical Engineering: Electricity, electric currents and magnetic fields, earth material
electric currents and magnetic fields, earth material, permanent magnet: An electric current is the result of an electromotive force (measured in volts) connected in a completed circuit where current (measured in amperes) flow through the conductors to a resistance or other power consuming device. The electric current is contained...

Electrical Engineering: Electricity generation, diesel fuels, electric generators
diesel fuels, electric generators, long distances: I don t think so. The efficiency of conversion from the big monopoly electric producers is much higher than small stand-alone devices that run from gasoline or diesel fuels; therefore the total emissions into the atmosphere would be greater - even though...

Electrical Engineering: Electricity, dry cell battery, voltage units
dry cell battery, voltage units, electron beam: Electric Force: Usually measured in voltage units, this is the potential to which the electron have been elevated and how far the energy must fall in order to bring them back to a nuetral energy level. For example, the tv picture tube must have a force...

Electrical Engineering: Electrodes, metal tabs, aa size
metal tabs, aa size, battery connector: You can connect the wires directly to the battery, but it is easier to do if you buy a battery connector (or it can be called a battery box, or battery holder). For a D, C, or AA size, it looks like part of a plastic box, with metal tabs at the ends to press...

Electrical Engineering: Electromagnet, model railroad track, electronic locks
model railroad track, electronic locks, electromagnet: Michael, Electromagnets are used in a number of items such as relays, motors. They are also used for electronic locks on doors. If you can get hold of a model railroad track switch (turnout), the item used to make the rails move is in may cases an electromagnetic...

Electrical Engineering: Electromagnet Design, brady brady, electromagnet design
brady brady, electromagnet design, magnet core: Brady, although this seems like a simple problem on the outset, it could get complicated. I can only suggest a couple of things. There are some safety issues as well. The current that can be provided by a car battery could be a much a 100amps. You must...

Electrical Engineering: Electromagnet Design, electromagnet design, open gap
electromagnet design, open gap, gauge wire: Here is one design approach for producing strong field strenght in an open gap of a laminated iron core: http://www.geocities.com/CapeCanaveral/2404/design2.html There is a wide variety of configurations. So, it will depend on the geometry of your core...

Electrical Engineering: Electromagnet, knife blade, knife switch
knife blade, knife switch, matter what type: I ve never heard of cpooer wire. (Just kidding, I guess you meant copper.) Yes, it should be copper wire. Any electrical wire you buy at a normal supplier (like Radio Shack) will be copper, even if it has a silver color (a silver color just means it is...

Electrical Engineering: Electromagnetic Currents, diameter wire, wire diameter
diameter wire, wire diameter, particals: It looks like you sent this question a few days ago, but I just received it a few minutes ago. I also received an email from ALLEXPERTS saying that it was somehow delayed. I hope that my answer is still in time for you. It is a little confusing to call...

Electrical Engineering: Electromagnets, electromagnet, electromagnets
electromagnet, electromagnets, typical application: An electromagnet is a device whos magnetic field can be turned on/off. Current flowing through the coil creates a very strong magnetic field. A typical application for an electromagnet is in a automobile junk yard where a crane is fitted with an electromagnet...

Electrical Engineering: Electronic pickups, zero volts, center conductor
zero volts, center conductor, ac signal: Hi Alex, To briefly summarize, the pickup senses the vibration of the string and an AC frequency is produced. This is a very small signal directly at the pickup that, as you know, must be amplified. The signal, as you stated, travels down a coaixial cable...

Electrical Engineering: Electronics, aes ebu, luck john
aes ebu, luck john, analog sound: This is not easy. The AES/EBU signal you are referring to is a PCM encoded data stream. It is a Manchester encoded signal stream called bi-phase mark. The signal must be detected, decoded and the left and right channel information must be extracted. ...

Electrical Engineering: Elementary School Electricity, protons electrons neutrons, fetchbook info
protons electrons neutrons, fetchbook info, electricity experiments: http://store.doverpublications.com/0486220303.html Let me recommend the above book; Electricity Experiments for Children. Not that they would copy from this book for their science fair, but that they could learn from reading the many experiments and pictures...

Electrical Engineering: EMP, 1967 corvette stingray, neutron bomb
1967 corvette stingray, neutron bomb, governmental restrictions: Depends entirely on the strength of the pulse and how it was pulsed. If from a distance, even though it was strong, it would be less directed and more distributed. If it were up close its strength would be focused more tightly. EMPs are not easy to generate...

Electrical Engineering: Emitter Follower, common emitter amplifier, class a amplifier
common emitter amplifier, class a amplifier, voltage divider: Let s look at the emitter follower in two ways: DC for biasing the transistor up into its center point and AC to look at the way the small signal ac characteristics behave. DC: The resistor dividers on the base circuit bring the voltage on the base up...

Electrical Engineering: Emitter Resistor, common emitter amplifier, bypass capacitor
common emitter amplifier, bypass capacitor, zero volts: Simon, First, go to the circuit that you referenced and re-draw it using only Vcc, RC, Q1(transistor), RE and ground. Connect V6 to the base of Q1. Label the collector as Vc and the Emitter as Ve. There are a couple of things to remember about transistors:...

Electrical Engineering: Energy Storage System, energy storage system, attention link
energy storage system, attention link, rs232 rs: I see. You are in advanced phase of your own development system. I can help if you will send me the block schema or concept diagram and other system parameters to me. I get what you mean but I need more detail about the system size (power range) the kind...

Electrical Engineering: Engineering terminology, data acquisition card, external supply voltage
data acquisition card, external supply voltage, internal circuitry: Yes, you are correct. It means the basic supply to the board should be 24v, but the board will continue to function properly should the voltage drop to 14 or rise to as high as 28v. The internal circuitry of the board has its own voltage regulation over...

Electrical Engineering: Equalizers and pickups and volume control, riaa curve, graphic equalizer
riaa curve, graphic equalizer, piezo devices: Simon, Actually, the piezo pickup is a constant velocity device which will give an output that is somewhat complimentary to the riaa equalization curve. But for it to be exact, you must compensate for the total audio band. The RIAA curve is used to compensate...

Electrical Engineering: ESD, red arrow, negative direction
red arrow, negative direction, zener voltage: Nice site. Nice circuits. Figure 3 works for me. Don t see any problem with it. When positive voltage rises high enough to reach .6v above the zener voltage the zener will conduct and keep the voltage from going any higher - or clamp it. In the negative...

Electrical Engineering: Experiment to find Inductance of inductor, inductive reactance, series resistor
inductive reactance, series resistor, inductor: Yes, that is true only if the R is equal to the inductive reactance. It may be a better choice to use the sampling resistor idea to calculate impedance. Use a sampling resister in series with the coil where the impedance of the coil is known to be much...

Electrical Engineering: Exterior remote heads, retail hospitality, professional engineer
retail hospitality, professional engineer, emergency egress: Yes, you are right about the matter of building codes and local requirements. Here is the thing: If there were a fire or unnatural emergency of some kind when the building was occupied and the occupants could not exit the building properly and the subject...

Electrical Engineering: earthing for electronic equipments and relays in EHV stations, cold water pipe, deep in the earth
cold water pipe, deep in the earth, earth ground: I need more information about the station and the environment. But, generally, an earth ground requires connection to something that is deep in the earth and has solid ohmic connections..... For example, in the residential home we use the cold water...

Electrical Engineering: elctrical engineeering, dwg drawings, safety earth
dwg drawings, safety earth, optimum layout: What? I received the DWG drawings in my email box. I looked through the 20 some odd diagrams and studied for a few minutes, but I did not see anything that jumped out at me. It would take me several hours to study through it and come up with answers to...

Electrical Engineering: electric baseboard heating, electric baseboard heater, electric baseboard heating
electric baseboard heater, electric baseboard heating, electric baseboard heaters: Al, I believe that the best approach would be to contact an electrician. You really can t expect a heater specified for 240 volts to run on a 120 volt line. I believe that a seperate line will have to be run to the new heater. This is important for safety...

Electrical Engineering: electric baseboard heating, electric baseboard heater, electric baseboard heating
electric baseboard heater, electric baseboard heating, electric baseboard heaters: Yes, it is possible; however, you will need an electrician to come into the house and rewire the baseboard circuit for 240v operation. It is highly recommended, for safety purposes, that you have a licensed electrician do the work, even though it is not a...

Electrical Engineering: electric baseboard heating, electric baseboard heater, electric baseboard heating
electric baseboard heater, electric baseboard heating, electric baseboard heaters: No, not easily. In order to use the 240 volt heater, you ll need to run another wire from the power panel to bring in the 240 volts. The 240 volts will use a different type of socket in the wall (if you use a socket). It shouldn t be a big job for an...

Electrical Engineering: electric wires, electrical interface, pin connections
electrical interface, pin connections, usb ports: I can guess, but to know for sure you must know the electrical interface. The schematic or wiring diagram for each device must be known such that each wire is connected. OR: You can just check the pin connections on the other end of each cable and...

Electrical Engineering: electric, salt concentration, mechanical restraint
salt concentration, mechanical restraint, copper wire: Okey. Probably insufficient current; try putting two batteries in parrallel; that will double the current. Also, there may be too much mechanical restraint on the copper wire. The force generated from the magnetic fields are very small, so the moving...

Electrical Engineering: electrical, fm radio band, radio data systems
fm radio band, radio data systems, time clock: Chad, They don t. Actually, they are set at the factory and if you get lucky, they end up in the right time zone! There are some, few, who have connections to the fm radio band and download the clock information from what is called RDS or Radio Data...

Electrical Engineering: electrical, hz systems, conversion issues
hz systems, conversion issues, radio shack: Fortunately, I have worked in Korea and dealt with the conversion issues. Both Korea and the US have 60 Hz. systems but distribute at 220 and 115 respectively. Unless your stereo is dual rated for 115/220 VAC, you will need a step up transformer to get 220...

Electrical Engineering: electrical, safety reference, reference point
safety reference, reference point, conductor: Earth is a reference point. And, some current does flow through ground; depends on the circuit, the ground/earth electrical and chemical conditions, etc. But, we don t think of the earth as a very good conductor, for sure. Our feet are planted on the...

Electrical Engineering: electrical, neutral earth, ground reference
neutral earth, ground reference, balanced inputs: Earth is a ground reference point; in electrical systems the main reference is generally earth - actually connected direclty to the earth grounding system. Neutral is a voltage reference in an electrical or electronic system - which may or may not be connected...

Electrical Engineering: electrical, mains power, system designers
mains power, system designers, arbitrary decision: It is an arbitrary decision made by the original system designers. Most of Europe and parts of Asia are on the 50Hz system. Most of North America is at 60Hz (multiple of 60 seconds per hour). See: http://en.wikipedia.org/wiki/List_of_countries_with_mains_power_plugs%2C_voltages_and_frequencies...

Electrical Engineering: electrical, synchronous generator, zero speed
synchronous generator, zero speed, elkraft: The basis for most low and zero speed sensorless control is that there exist a difference in the direct and quaderature inductance of the machines. This difference is also referred to as saliency. The above comes from the first reference in the first...

Electrical Engineering: electrical, load currents, maintenance outage
load currents, maintenance outage, duty cycles: The soaking process is to determine the sufficiency of the cooling oil for continuous operation under thus and thus temperature and duty cycles. If an outage occurs placing heavy load currents on a transformer it must be assured that it will survive without...

Electrical Engineering: electrical, power watts, efficiency power
power watts, efficiency power, electrical question: Depends entirely on the size and design of the transformer. You should contact with the manufacturer or the sales rep to get this information. But, in most designs you fill them up until they are full, then leave an air space for expansion when it gets hot...

Electrical Engineering: electrical engineer, electrical engineer, aerospace applications
electrical engineer, aerospace applications, bz: I don t know why, but this question just popped now. It looks like you sent it two days ago. Yes, I enjoy my work very much. I started my own company in October of 2003. I design sensors of many types for commercial, industrial, military, and aerospace...

Electrical Engineering: electrical engineering, strange term, small appliances
strange term, small appliances, kitchen appliance: http://en.wikipedia.org/wiki/Ceiling_fan See the above for ceiling fans and similar applications. I don t know what you mean for whippers is a strange term for me. Are you talking about a kitchen appliance that is used for stirring and whipping food...

Electrical Engineering: electrical engineering algebra, e mail address, mesh analysis
e mail address, mesh analysis, polynomial equations: Kevin, Below is the previous answer. Hi Kevin, Polynomial equations occur frequently when electrical engineers are performing a circuit analysis. A circuit analysis is required to insure that theoretically, the circuit will perform as expected. Check...

Electrical Engineering: electrical engineering, math math, science exposure
math math, science exposure, op amp circuit: For some reason, math and theoretical circuit modeling falls through the cracks for many EEs after college. Too may times I have seen circuits that have been slapped together by feel only to find, after a lot of wasted time, that a little modeling and analysis...

Electrical Engineering: electrical project, audio power amplifier, uoguelph ca
audio power amplifier, uoguelph ca, output transistors: http://my.integritynet.com.au/purdic/ http://www.web-ee.com/ http://www.uoguelph.ca/~antoon/gadgets/gadgets.htm http://www.aaroncake.net/circuits/index.asp The sites above will give you some ideas. But, as an old college professor, I can tell...

Electrical Engineering: electrical safety- grounded conductor, true earth, household wiring
true earth, household wiring, earth ground: A circuit must have the same current OUT as IN. So, if you think of a two wire system, the current passing out of one wire must be exactly the same as the current coming back in on the other wire. The entire voltage drops across whatever the load is at the...

Electrical Engineering: electrical science, thermal conductor, electrical science
thermal conductor, electrical science, mandatory check: The simple answer is that the transistor generates heat as a normal part of its functioning and must dissipate this heat. The heat sink is a large highly temperature conductive (and often electrically conductive as well) object which will draw the heat away...

Electrical Engineering: electrical, vertical interval, closed captions
vertical interval, closed captions, pbs stations: VCRs that have the extra hardware and software include a feature that searches for a TV signal that sends a time code in the vertical interval portion of each frame of the picture. Most PBS stations send this signal out when they are broadcasting the network...

Electrical Engineering: electricity, poor conductor, electrical conductivity
poor conductor, electrical conductivity, copper strip: Measurment of conductivity is not simple for materials that are not metal. Here is one of the science fair experiments that you may be able to use: http://www.funsci.com/fun3_en/electro/electro.htm Here are some other links you may want to see: http://www.ndt-ed.org/EducationResources/CommunityCollege/Materials/Physical_Chemical/Electrical.htm...

Electrical Engineering: electricity, earth ground, clothes dryer
earth ground, clothes dryer, system phase: I assume that you re asking about the wiring in a house in the USA. There are two phases of 110VAC in your breaker box. One (phase 1) is 180 degrees out of phase with the other (phase 2). So you have a neutral, phase 1, and phase 2, that s three wires...

Electrical Engineering: electricity, electricity travel, electromagnetic propagation
electricity travel, electromagnetic propagation, conductor wire: Current in a wire is from a charge which propels itself down the wire at nearly the speed of light, or 186,000 miles per second. The electrons which are the recipient of the charge migrate down the wire at a much reduced velocity. Due to the charge configuration...

Electrical Engineering: electricity generation from low heat source, internal combustion engines, radiator system
internal combustion engines, radiator system, electricity generation: In order to generate energy with a thermopile (such as a set of thermocouples with a hot -side plate and a cold -side plate), you need a heat source and you need a sink that is cooler than the heat source. So, you could add one to a hot part of an engine...

Electrical Engineering: electricity, incandescent lightbulb, tungsten filament
incandescent lightbulb, tungsten filament, semiconductor junction: I m not sure that I understand your question. Are you talking about a standard household incandescent lightbulb? It lights due to current passing through a tungsten filament (a thin wire) and heating it to such a high temperature that it gives off some visible...

Electrical Engineering: electromagnetic wave energy, radio control airplane, electric field intensity
radio control airplane, electric field intensity, antenna height: You can transmit a given frequency by using more or less power. A small radio control airplane uses frequencies close to industrial transmit frequencies, but the radio control uses less than 1/2 watt and can transmit about a mile. The industrial transmitters...

Electrical Engineering: electromagnetic wave propogation, frequency radio waves, high frequency radio
frequency radio waves, high frequency radio, frequency waves: Good questions. If you will go to the web site below and read it from beginning to end it will give you a very good idea of the answer to your questions. http://www.fas.org/man/dod-101/navy/docs/es310/propagat/Propagat.htm If there are further questions...

Electrical Engineering: electromagnetic waves, tv waves, spark gap
tv waves, spark gap, radio bug: Electromagnetic waves can be generated at very low frequencies, but it requires a very long antenna because the trannsmission is less effective with a low rate of change of the signal level. Low frequency transmissions in the less than 10 kHz range, for communication...

Electrical Engineering: electron movement, steady magnetic field, electron movement
steady magnetic field, electron movement, student question: The answer is revealed in the following web site: http://www.pa.msu.edu/courses/1997spring/PHY232/lectures/magforces/righthandrule.html Since this sounds like a student question, I am giong to leave the actual answer for you to determine. But the use...

Electrical Engineering: electronic circuits/electronic theory, variable resistor, hz tone
variable resistor, hz tone, ac electricity: If you just want to produce a tone at the line frequency of 50 Hz, then you can use a transformer that is rated for 240 VAC on the primary and 3VAC on the secondary. The 3 VAC will be connected to the speaker, and will be sufficient to generate a 50 Hz tone...

Electrical Engineering: electronics, reverse saturation current, pn junction
reverse saturation current, pn junction, 1n914: These parameters are specific to the diode. You must know the 1N number and then look up the electrical characteristics from the data sheet. http://www.nxp.com/acrobat_download/datasheets/1N914_914A_914B_4.pdf The above site is a spec sheet for a 1N914,...

Electrical Engineering: electronics and instrumentation or electronics and communication, daily chores, economic practices
daily chores, economic practices, contract worker: This will come from you personal interests. Where do you want to live? Do you want a big city or a small city? Do you like big company environment or small company? Or do you want to be a self-employed free lance technical contract worker? Is salary...

Electrical Engineering: electronics, logic ics, electronic gates
logic ics, electronic gates, switching devices: They are. Many logic ICs are based on transistor switchting. There are many products that employ transistor switching systems. In the early days nearly all electronics switching was done by transistors. Now days there are so many other devices and applications...

Electrical Engineering: electrostatic deflection, cathode ray tube, deflection yoke
cathode ray tube, deflection yoke, line output transformer: Electrostatic deflection uses a high voltage (in the mid hundreds to low thousands of volts range) difference across opposing plates to push the electron beam in the desired direction. (Instead of the traditional way, which is using electromagnetic fields...

Electrical Engineering: elements, coil material, circuit breakers
coil material, circuit breakers, light bulbs: Maybe your observations are different from mine. I have found light bulbs (incadescent varity) fail at any random time - maybe when first turned on, but not always. Burner elements are a totally different material and application. They are not encased...

Electrical Engineering: back emf, inductive reactance, theoretical explanation
inductive reactance, theoretical explanation, current times: Back EMF is sort of a theoretical explanation. The back EMF is the voltage that appears across the inductive reactance of the motor. It is still the voltage across the motor, so current flows into the motor based on the voltage of the back EMF divided by the...

Electrical Engineering: energy usage of household appliances, household appliances, thick batter
household appliances, thick batter, power consumption: Power in watts is equal to voltage times current. So, if the voltage is 120v ac and the unit draws 1 amp, the power consumption is 120 watts - while it is running. HOWEVER: The ratings give on appliances are under some standard testing conditions that...

Electrical Engineering: engineering question, homework question, pilot friend
homework question, pilot friend, line of flight: This sure sounds like a homework question but: I d like to know the runway orientation at the small airport. If they need to line up on a runway perpendicular to their present line of flight, it doesn t matter, they don t have enough height. If you assume...

Electrical Engineering: engineering software, wire resistance, cable awg
wire resistance, cable awg, visual foxpro: http://www.securityideas.com/howtocalvold.html http://www.epanorama.net/documents/wiring/wire_resistance.html http://www.interfacebus.com/Reference_Cable_AWG_Sizes.html http://www.stealth316.com/2-wire-resistance.htm (This is a good one) No, I...

Electrical Engineering: engineering/solar panels, solar water heater, gas water heater
solar water heater, gas water heater, internet hope: A solar panel is required if you want to generate electricity, but there other ways derive power from solar energy. The main one is to build a solar water heater to replace your electric or gas water heater. I ve heard that they work well, and you should...

Electrical Engineering: engineering, product development engineering, manufacturing engineer
product development engineering, manufacturing engineer, developing products: When I first started working, it was sunny, about 70 degrees, the birds were singing... (just kidding). The first day I started working as an engineer was great. And it s been great ever since. I applied for a job as a technician, because I was still...

Electrical Engineering: Do I have enough power?, watt stereo amplifier, amp line
watt stereo amplifier, amp line, circuit breakers: Standard 120v ac outlets are good for about 8 amp draw safely before blowing a breaker. Some circuit breakers will handle up to 12 amps safely. (Figure about 1500w is maximum draw from one power circuit). If your amplifiers draw more than that you should...

Electrical Engineering: exciter circuit, tyristor, voltage regulators
tyristor, voltage regulators, google: I don t have the time and energy to design a circuit for you now and I can t find a site that gives what you are looking for. I suggest you google for voltage regulators using thyristor control and plow through some of the listings. It is a tedious process,...

Electrical Engineering: Faraday Cage/Ice pail effect, magnetic field strength, hollow sphere
magnetic field strength, hollow sphere, eddy currents: A changing magnetic field induces eddy currents in a conductor, and therefore causes loss of the magnetic field strength. If the aluminum sheet is thin enough, the loss will be less. The aluminum would probably have to be less than 0.001 thick to start...

Electrical Engineering: FINDING THE RIGHT UPS, power spike, watt range
power spike, watt range, minutes of power: One thing that can trip up those looking for a UPS is the inrush or momentary power spike when you first turn on a PC. Check if your servers specify that value. Also, look at how many monitors you need to support. If a switch is used to share 1 monitor...

Electrical Engineering: Final Anode, high voltage system, high voltage generator
high voltage system, high voltage generator, flyback transformer: Not too sure what black can you are asking about. There are cages in most tvs that contain the high voltage generator. The HV generator consists of a autotransformer flyback that is in the circuit of the horizontal deflection amplifier. When the horizontal...

Electrical Engineering: Finding equivalent resistance, ohm resistor, parallel connection
ohm resistor, parallel connection, resistors: I m not sure that everything lined up right as I received it, but I think I have it. Assuming that you want the resistance as measured across the 40 ohm resistor: the 60 and 20 ohms=80 ohms in parallel with 5 and 40. the 25 is also in parallel. So the total...

Electrical Engineering: Finding a UPS for an LCD projector, sony vpl, backup purpose
sony vpl, backup purpose, lcd projector: Are you afraid of power failures in your area? Yes, because of the heat generated by the backlight system there is a shut-down cycle that cools the lamp before power goes totally off. If the cycle is not allowed to complete it may cause damage to the system....

Electrical Engineering: Finding a UPS for an LCD projector!, sony vpl, backup purpose
sony vpl, backup purpose, lcd projector: Yes, a 600 VA supply would be fine, if it is rated for 240V input power. The VA rating is essentially the same as a power rating in watts, except for the power factor, which means that the current and voltage may not be at the same phase angle. So, for that...

Electrical Engineering: Florescent fixture wiring situation, stepdown transformers, shop fixtures
stepdown transformers, shop fixtures, earth ground: You will have to replace the ballasts, probably. I do NOT recommend you try to convert the shop fixtures over to 240v. Rather, you should bring out 120 to the lamps. Otherwise the UL safety certification will be invalidated. Also, the lamps may not do...

Electrical Engineering: Flow measurement, industrial instrumentation, electronic engg
industrial instrumentation, electronic engg, flow measurement: Again, it depends on the system. It may be whatever is controlling the pressure has a sensitivity to temperature. But if the source of gas is a tank having some liquid and some gas, then the pressure may be controlled by the vapor pressure of that liquid...

Electrical Engineering: "Fluorescent regular tube light" and its effect on humans, phosphor coating, tube light
phosphor coating, tube light, google: I am no expert on this subject without some research. In fact, there are still studies going on that indicate the industry is still learning about the effects of fluorescence on humans. They are now learning that in offices a little incadescant light mixed...

Electrical Engineering: FM receiver, frequency mixer, radio receivers
frequency mixer, radio receivers, difference frequency: The circuit you sent is a frequency mixer. The device is non-linear so it produces an output which contains both of the original frequencies, the sum of them and the difference. The difference frequency is 10.7 mHz - the IF frequency used in FM radio receivers!...

Electrical Engineering: FM transmission 88-108, fm radio receiver, fm receivers
fm radio receiver, fm receivers, rf tuner: I know of no way without an individual center frequency for each spot on the band. However, there may be ways to simplify such a transmitter by doing digital multiplying that would make it very easy for such a transmitter to cover the whole band. I am...

Electrical Engineering: Fm circuit, diode switches, voltage swings
diode switches, voltage swings, voltage drop: Very simple. The diodes when forward biased would have aproximately a .6 or .7 volt drop across them. Thus one diode will shunt the output when the voltage swings positive; the other when the voltage goes negative. A diode switches ON and has very...

Electrical Engineering: Fm Transmitter, sine waves, tank circuit
sine waves, tank circuit, spectrum analyzer: There are a lot of possibilities: the main one one is , as you ve said, a 1kHz square wave does not have all of its energy at 1 kHz. If you looked at it on a spectrum analyzer, you ll see energy over a wide spectrum, with concentrations at many points (the...

Electrical Engineering: Foot Spa Motor!, spa motor, foot spa
spa motor, foot spa, jet motor: Congratulations on your pending graduation. You can purchase a good enough vom at walmart or home depot for under $10. A worthwhile investment for any engineer because you are going to run into these little problems for the rest of your life and having...

Electrical Engineering: Fourier vs Laplace, boundary value problems, approaches infinity
boundary value problems, approaches infinity, drexel university: Nil, I had to ask one of my old college professors at Drexel University this one. Here is his reply: John, Regarding the difference between Laplace Transforms (LP) and Fourier Transforms (FT), FT is a specific case of LT, which is more general. ...

Electrical Engineering: FPGA, programmable gate array, field programmable gate array
programmable gate array, field programmable gate array, intel microcontrollers: A field programmable gate array contains a large set of logic elements that are interconnected by electrically controlled connections. Usually on startup, a file is loaded that configures the gate array according to the designed functions. A long explanation...

Electrical Engineering: Fuse & switch ratings: amps v watts, fuse switch, mobility scooter
fuse switch, mobility scooter, auto systems: For your fuses and switches, you need to look at the amps, not the wattage. And actually, the current for the bulb is even greater when turned on, because the filament is not heated up yet. It doesn t matter how long the switch is turned on. The switch...

Electrical Engineering: Future electrical engineer, mechanical engineering courses, audio engineering society
mechanical engineering courses, audio engineering society, basic circuit theory: The EE faculty member is Ron Schafer; also author of a famous DSP text book. He has good experience in audio related areas and is one of the outstanding faculty of GT EE department. He may have retired, although I am not too sure about it. Another great...

Electrical Engineering: Future, human resource director, company reputation
human resource director, company reputation, patent law: It is the same, nearly, in this country and all developed countries that an engineer must study the field broadly. So, in that regard, your situation is no different. A typical EE course in the USA offers only a few electives, but the student must study...

Electrical Engineering: 12 v Transformer, power capability, seperate
Electrical Engineering: 12 v Transformer, power capability, seperate, taps

Electrical Engineering: 12 volt LED, 12 volt
Electrical Engineering: 12 volt LED, 12 volt

Electrical Engineering: 12v lighting vs 220v lighting, low voltage lighting, low voltage systems
Electrical Engineering: 12v lighting vs 220v lighting, low voltage lighting, low voltage systems, electrical current

Electrical Engineering: 1970's MXR 10 Band EQ Pedal, mid seventies, analog components
Electrical Engineering: 1970's MXR 10 Band EQ Pedal, mid seventies, analog components, google

Electrical Engineering: 3 phase 4wire delta output (high leg/wild leg), phase power
Electrical Engineering: 3 phase 4wire delta output (high leg/wild leg), phase power

Electrical Engineering: 3 phase basics, phase delta, delta service
Electrical Engineering: 3 phase basics, phase delta, delta service, 2 legs

Electrical Engineering: 4-20mA Loop, noise immunity, digital indicator
Electrical Engineering: 4-20mA Loop, noise immunity, digital indicator, physical quantities

Electrical Engineering: AC/DC Relay Circuit, crazy glue, phototransistor
Electrical Engineering: AC/DC Relay Circuit, crazy glue, phototransistor, ethernet link

Electrical Engineering: audio transformer, rc time constant, copper conductor
Electrical Engineering: audio transformer, rc time constant, copper conductor, audio transformers

Electrical Engineering: Battery Charging Amps, vrla batteries, current 2
Electrical Engineering: Battery Charging Amps, vrla batteries, current 2, 9a

Electrical Engineering: BRUSHLESS GENERATOR, stator coils, field windings
Electrical Engineering: BRUSHLESS GENERATOR, stator coils, field windings, bridge rectifier

Electrical Engineering: a blinking light bulb, fluorescent lamp starter, sw
Electrical Engineering: a blinking light bulb, fluorescent lamp starter, sw

Electrical Engineering: Cable Earthing & personnel safety, long distance, earth
Electrical Engineering: Cable Earthing & personnel safety, long distance, earth

Electrical Engineering: Calculating the duration a UPS will last., circuitry, amount of time
Electrical Engineering: Calculating the duration a UPS will last., circuitry, amount of time, ups

Electrical Engineering: Carbon brush function, armature windings, carbon brushes
Electrical Engineering: Carbon brush function, armature windings, carbon brushes, dc motor

Electrical Engineering: Converting a 50Hz appliance to 60 Hz?, power source
Electrical Engineering: Converting a 50Hz appliance to 60 Hz?, power source

Electrical Engineering: CT meter, multiplication factor, specialy
Electrical Engineering: CT meter, multiplication factor, specialy