| for a linear two-terminal element or two-terminal circuit, under sinusoidal conditions, quantity equal 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. See 131-11-45.