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: Reactive power is measured in volt-amperes reactive (VAR) or kilovolt-amperes reactive (kVAR).

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: Apparent power is the vector sum of active power (P) and reactive power (Q): S=P2+Q2S=\sqrt{P^2 + Q^2}S=P2+Q2​ where SSS is apparent power.

: Apparent power is measured in volt-amperes (VA) or kilovolt-amperes (kVA).

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: Active power represents actual power consumed to perform work, while reactive power is the non-working power exchanged due to reactive components.

: Apparent power is the vector sum of active and reactive powers and is always greater than or equal to either of them (except when Q=0Q=0Q=0).

In summary, active power is the useful power consumed by a load, reactive power is the non-useful power due to reactive elements, and apparent power is the total power supplied to the load, including both useful and non-useful components. Understanding these distinctions is crucial for designing and managing efficient electrical systems.