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'Active power' (also known as 'true power' and 'real power') is the rate of energy dissipation by the in-phase component of current in an AC circuit, expressed in watts.

Active power is the vector-difference between apparent power (measured in volt amperes) and reactive power (measured in reactive volt amperes).

Expressed in terms of apparent power: Active Power = Apparent Power x power factor = U I cos (phi)

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