Electrical Engineering

14 AWG copper conductors are limited in the NEC to 15 amps. You must protect them with an overcurrent device such as a breaker or fuse not exceeding 15 amps.

The voltage drop along the slide wire of potentiometer can be controlled by adjusting the value of working current. The process of adjusting the working current so as to match the voltage drop across the portion of sliding wire against standard reference source is known as standardisation

0.0947

It's supposed to be non-conductive yet it transfers heat. Dielectric grease is often used with a heat-sink to transfer the heat better and it can also be used in applications where electrical components might get damp and/or hot and corrode. Most auto manufacturers are using dielectric grease or other grease compounds to protect light sockets and other electrical connections.

3.98mV

To make a full subtractor, you need an XOR and a NAND gate.

depends on your load...

when a capacitor reaches it, it acts as a battery

A choke coil is an inductor, which is designed to block a particular frequency in an electrical circuit while passing signals of very less frequency or direct current.

24.8 Volts

The impedance of a centre fed dipole at resonance is about 73 ohms. The feed impedance of a folded dipole is four times that, 292 ohms. The feedpoint is of course balanced in both cases, thus 300 ohm balanced line is an excellent match for the folded dipole active element of a commercial TV antenna.

A shading coil induces currents to create an additional electrical phase. The coil pauses slightly to control magnetic flux. Delaying magnetic flux allows for a secondary rotating magnetic field to build.

Voltage stabilizers are the circuits that are used to filter noise from the source voltage. DC voltage generated from a bridge network or diode network will contains voltage glitches. These glitches may cause serious problems to the operation of digital circuits. So a voltage regulator is used to filter these glitches. voltage stabilizer can be built using a voltage regulator ICs like 7805 for +5V, 7809 for +9V, 7905 for -5V, 7909 for -9V and so on.

this is a method to fined the fault in the underground wires.In this method we replace two arm of the wheat stone bridge with the testing wire and the another wire and calculate them using relation R1/R3=R2/R4.

For all practical purposes NO. The only voltage measured will be the voltage drop of the contact itself. This should be very low if the contact is good.

The current supplied to the filament for heating is defined as the Filament current.

whereas

When the filament is heated to a high temperature, the electrons are emitted. The flow of electrons form Cathode to anode is the tube Current.

There is none, glass is much stronger, but i suppose it depends on the use.

The basic difference between the air cooled transformer and oil immersed transormer is: If the heat generated in the transformer winding is capable of being swapped by the sarrounding ambient air without causing any problem to the performance of the transformer then its normally reffered as Naturally Air Cooled transformer or simply air cooled transformer. However when the capacity of the transformer increases, the heat generated in the winding of the transformer is more and the ambient air normally is inadequate to cool the windings and maintain the performance of the transformer. Its because of this reason the transformer windings are submerged in an oil tank. It has been observed that the hydrogen ions present in oil help to maintain the temprature of the winding of the transformer and thus overall performance of transformer.

I think you will find (in the US at least), that almost all utilities will refuse to provide 3-phase power to a residence. If you have just one thing such as a motor that you need three-phase to run, you can purchase a phase convertor to convert your single-phase to 3.

Yes. Provided that it has above 12 V output. I will. You must have a diode in place though.

5kw = 6.25 kva becoz kva = kw/ pf if we take pf is o.8

The Wye (also know as Star - especially in the motor rewind industry) is a 4-wire system which provides two different supply voltages. The center-point of the Wye is the system neutral and is usually solidly grounded. Where it is desirable to limit the phase-to-ground fault magnitude the center-point of the Wye may be connected to ground through and neutral grounding resistor or a current limiting reactor. Because the system is tied to ground it is easy to provide system ground fault protection. Three-phase loads can be connected phase-to-phase and singlephase loads can be connected from any phase to the system neutral. On a wye system, the phase unbalance currentis carried by the system neutral. On a Wye system the line current is equal to the phase current i.e. ( ILine 1 = IPhase A) and the line-to-line voltage is equal to the vector sum of two individual phase voltages i.e. (E Line1-2 = E PhaseA + E PhaseB' ). In a Wye system the phase-to-phase voltage is 1.732 x the phase-to-ground voltage. Some typical Wye system voltages are: 120/208Y, 277/480Y, 2400/4160Y, 4160/7200Y, 7200/12470Y, 7620/13200Y,and 19920/34500Y

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