Electrical Engineering

Basically the formula is I = P / V where I = amps, P = power (kV) and V = volts for a single phase 11 kV genset the formula is 11000/400 = 27.5 amps max load. For a 3 PHASE GEN then 11000x0.8/400/3 = 7.3 amps per phase.

Each insulator is rated according to its ability to insulate. For example, if one insulator is good for x volts, then four insulators will be required for a line conductor operating at 4x volts with respect to earth (ground). However, additional insulators might also be inserted to compensate for local conditions -e.g. salt deposit (near the sea), industrial pollution (near factories), etc.

never heard of a 415 motor..

A 'tap' is a connection made part-way along the length of a transformer's winding. In the case of a standard North American distribution transformer, the 240-V secondary winding is centre tapped and earthed, providing both a 240-V (across the entire secondary) and a pair of 120-V (between each end, and the centre tap) supplies to a building.

Kirchoff's laws are so named because they were developed by Gustav Robert Kirchhoff.

A: As a DC source change state rapidly this variation is consider an AC component

'Balanced loads' apply to three-phase a.c. loads. A three-phase kilowatt hour meter will measure both balanced and unbalanced loads, when correctly connected.

It depends entirely on the design of the motor.

The field current of a dc motor provides the magnetic field that allows the motor to develop a torque when current flows through the armature..

No. You can not step up power with a transformer. You can step up voltage, while stepping down current, or you can step up current, while stepping down voltage, but you cannot step up (or down) power.

Why input current of USis less than Output current?

A person can find out motor winding, common start, and run connections through the use of operational manuals that came with a vehicle. Another source would be a repair manual specifically written for a certain make and year of automobile.

Yes it can work on ac source but u will need a different design keeping in mind about the polarity.

Well first we need to generate voltage from electrical generator. Then if voltage are below 4160 volt step up Transformer is used and if voltage are above 4160 volt step down Transformer is used. Generally voltage produced from generator are low so we need to step up voltage to higher values such as 240 kilo volt to transmit them to longer distances to reduce power losses.

The conditions are:-

1. If there will be frequency difference between the alternator and power line.

2.If they will not be in same phase sequence.

Turn off the supply before using the ohmmeter,it will damaged your ohmmeter when supply is present.

it must be capacitive in nature..as attenutors works.

An ammeter.

Intrinsic safety is a protection technique for safe operation of electrical equipment in hazardous areas (e.g. explosive materials, flammable materials).

The main advantage i
s that it
s cheaper. Since U do not have 2 separate windings, it'
s cheaper to manufacture. Unfortunately, it's not isolated.
AutoTransformers are used for converting USA-2-Euro voltages
and vice-versa. BUT, since one leg is common to both, U do not
have electrical isolation from primary to secondary.

You do not use AC to megger a device, because the purpose of meggering is to measure the insulation resistance of the device. You use DC to do that. If you used AC, you would be unable to differentiate between insulation leakage and capacitance.

The formula you are looking for is volts x amps divided by 1000.

2008 NEC Section 358.30 requires EMT to be securely fastened every 10'.

The power going into a transformer (primary) is the same as the power leaving a transformer (secondary).

P=VI Power = Voltage X Current.

A step down transformer means that the voltage leaving a transformer is less than the voltage entering the transformer. The power out is the same as the power going in, so if the voltage is less, the current must be greater. Well said. This is why transformers are rated in VA, on bigger transformers KVA. Both sides have to be equal.

I've not heard the term "bressless" - I think you mean "Brushless" - which is a DC Motor that does not use the usual commutator/brush arrangement. For a great answer to this question, see the Wikipedia article in the related links section.