What unit is used to measure real and reactive power?

The correct unit used to measure real and reactive power in electrical systems is the voltampere (VA). Real power, which is the actual power consumed by electrical devices and performs useful work, is measured in watts (W). Reactive power, which arises in AC systems and does not perform any useful work but is necessary for maintaining the voltage levels in the system, is measured in voltamperes reactive (VAR).

The term voltampere combines both types of power in alternating current (AC) circuits, representing the total apparent power. While watts represent only the real power component, voltamperes account for both the real power and the reactive power components. Thus, understanding the difference is crucial because it reflects how power is managed in electrical systems.

Joule (J) measures energy, while ohm (Ω) is the unit for resistance. Therefore, the best choice for measuring real and reactive power in this context is voltampere.