## Power:

Power may be defined basically as the rate of doing work. In an AC circuit, the electrical power may be of three categories:

## Active Power:

Actually, the power consumed by an AC circuit is called Active or True power. It is the product of the apparent power and the power factor of the AC circuit.

## Reactive:

The power taken by pure inductance or the capacitance of an AC circuit is known as the reactive power.

Now, reactive power = V_{RMS} x I_{RMS} x sinΦ

= Apparent power x sinΦ

The unit of reactive power is volt-ampere reactive (**VAR**)

## Apparent Power:

It is the product of the RMS value of the applied voltage and the RMS value of the circuit current.

Apparent Power = V x I

In the case of DC, the unit is watt, but in the case of AC, the unit is volt-ampere.