THE ALTERNATING CURRENT SYSTEM
In alternating current system (AC) we are dealing with three types of power. These are the following:
1. Real power (P) by which its unit is expressed in watts (W).
2. Reactive power (Q) by which its unit is expressed in reactive volt-amperes (VAR).
3. Apparent power (S) by which its unit is expressed in volt-amperes (VA).
