for a linear two-terminal element or two-terminal circuit, under sinusoidal conditions, quantity equal to the mean value of the product of the instantaneous voltage u and the instantaneous current i′ which is equal to i but leading it by π/2:
where T denotes half the period of u, Q being equivalent to the product of the apparent power S and the sine of the displacement angle φ
Note 1 to entry: The reactive power is the imaginary part of the complex power , thus . Its absolute value is equal to the non-active power, thus . Note 2 to entry: The coherent SI unit for reactive power is voltampere, VA. The special name var and its symbol var are also used.
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