True power (P) is measured in watts (W) and represents the actual power consumed or generated. Reactive power (Q) is measured in volt-amperes reactive (VAR) and represents the power flow required to maintain the electric and magnetic fields needed for power transmission but does not perform work. Apparent power (S) is measured in volt-amperes (VA) and represents the total power flow including both true power and reactive power.

2. True Power = P
Measure in Watts (W)

3. Reactive Power = Q
Measure in Volt-Amps-
Reactive (VAR)

4. Apparent Power = S
Measure in Volt-Amps
(VA)