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Electrical Engineering
Electrical engineering is a field of engineering that deals with the study and application of electricity, electronics and electromagnetism.
23,056 Questions
Cold-Rolled Grain Oriented silicon steel. Used in transformer core laminations.
whatisCRNO? in transformers
Ohm's Law says I = V/R. You need to know the voltage across the component and its resistance, for that particular temperature and time, in order to calculate the current in the component at that instance.
my 1994 s10 has manual mirrors, windows and doorlocks but when i removed the door panels to replace the outside mirrors (AGAIN!) I saw that I am already wired for the electric stuff, i just have to pay more $$ for the electrical version of the part and plug it in! try going on ebay, most sellers will give you a kit to make power mirrors, my buddy converted his over doing that
Does a three phase motor have a neutral?
No, three phase motors do not actually have neutral line unless you are referring to the motor control centre where a neutral line is required when your control coils and other components are single phase operated
A 100 ohm resistor is placed across a 100v power source what is the power?
Power dissipated in a resistance = E2/R = (100)2/100 = 100 watts.
12 volt dc current output
Acdc has been called many things but the one it was called the most is the thunder from down under
Can the impulse withstand voltage be affected by altitude?
Yes. The IEC 60071.1 Std states a diminish withstand of aprox of 1% every 100mts above 1000mts. For example: for a 13.8kV system the insulation level should be of 95kV (interior). If the installation is going to be at 1,500mts then de minimum insulation level of your equipment must be: 95kv/(1-0.01*(500/100)) = 100kV BIL.
The next std value for BIL is 125kV.
What is service mains in power transmission system?
A 'service mains' is not associated with an electricity 'transmission' system, but with a low-voltage 'distribution' system. The service mains is the name given to the cable that connects a building to the low-voltage mains supply.
Why ordinary bulb has short life?
Because an 'ordinary' bulb has a metal filament which glows through resisting the electricity flowing through it. This eventually weakens the filament and it breaks.
The 'energy-saver' bulbs are basically miniature fluorescent tubes - these have electrodes at either end of the tube which generate electricity, this 'excites' the molecules of the fluorescent coating - producing light. They only fail when there's no more coating inside the tube - which means they last MUCH longer !
What is the features of MCC panel?
the features of mcc panel are it protect the motor stater wiring when current is overload
Capacitors are named after the type of dielectric used to separate the plates. So a mylar capacitor uses a mylar dielectric. Mylar is the trade name for a form of plastic film manufactured by Dupont.
You seem to be mixing up your terminology. There is no such thing as 'self-capacitance of an inductor'! If you know the frequency and equivalent capacitance for two capacitors, then you can find the equivalent capacitive reactance of the capacitors, but that's not what you seem to be asking! I suggest you rephrase the question.
Is a 20T motor slower than a 15T motor with a 19T Pinion?
Yes The 20T motor is slower than the 15T motor with The 19T pinion
Who can tell? The power rating of a resistor simply tells us the maximum power that resistor is capable of handling; it doesn't tell us anything about the actual power being produced for any given current. So, to find out the voltage drop across that resistor, you will need to find out its resistance, and multiply this value by the current you specify.
Does demodulated output depend on carrier amplitude?
Only in an AM system. In an FM system, variations in carrier amplitude
are ironed out with hard limiting before demodulation.
Why ac voltage of inverter measures 95.1 volts?
Because inverters do not produce a pure sinewave AC and you did not use a True RMS digital meter to measure the voltage.
Meters that are not True RMS actually measure the average, then display the value on a scale that assumes the input is a pure sinewave showing what the RMS would be for that average. For waveforms significantly different from sinewaves (as the inverter produces) that displayed value can be seriously wrong.
In the circuit where the DC motor is added, it was not specified whether the motor was added in series or in parallel to circuit elements. If it was added in series, it will increase circuit resistance and it will cause circuit current to go down. In parallel, the motor will reduce total circuit resistance, and circuit current will increase.
How to Test for single phasing?
You can do that in one of three ways:
1- current on each phase,
2- phase to gnd voltage,
3- phase to phase voltage,
preferably with multiple meters, the three lines has to be balanced within ~ 3%
Why are audio frequencies difficult to radiate?
In order to radiate and intercept energy efficiently, the physical size of the transmitting and receiving antennas must be an appreciable portion of the E & M wavelength.
An electromagnetic wave at an audio-frequency ... let's say 1 KHz ... has a wavelength of
( c / 1,000 ) = ( 3 x 108 / 103 ) = 3 x 105 = 300 kilometers = about 186.4 miles
Even at the nominal limit of the frequency range of hearing ... say 20 KHz ... the wavelength is
( 3 x 108 / 2 x 104 ) = 15 kilometers = 9.3 miles.
In order to have a fighting chance of successful radio communication at audio frequencies, over reasonable distances using reasonable transmit-power, the parties at each end of the link need antennas measured in miles.
There are plenty of other great reasons that we don't use radio at the physical baseband frequencies; but even of there were no others, this reason alone is a pretty potent show-stopper.
Why railway used 25 kv system?
25kV is used with 50Hz systems, and 15kV is used with 16 2/3 Hz systems. With higher frequency the power lines have higher impedance and you need higher voltage to transfer energy.
What is the principle that bullet train work on?
The principle with which the bullet train works is the Magnetic Levitation. U can see the following link to know more about it. http://science.howstuffworks.com/maglev-train.htm
