Approved Training Organization (ATO) Test 3 Alternating Current (AC) Practice

Which unit is used for reactive power in AC circuits?

VAR W VA kW

Correct Answer:

VAR

Explanation:

Reactive power measures the energy that shuttles back and forth between the source and reactive elements (like inductors and capacitors) due to the phase difference between voltage and current. Because it represents this oscillating energy, its standard unit is volt-amps reactive, written as VAR. Real power, the portion that actually does work, uses watts (W), with P = VI cosφ. Apparent power, the total power flow, uses volt-amperes (VA), with S = VI. Kilowatts (kW) are just real power in thousands of watts. So the unit for reactive power is VAR.

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