| for a two-terminal element or a two-terminal circuit under periodic conditions, quantity equal to the square root of the difference of the squares of the apparent power S and the active power P |
Note 1 to entry: Under sinusoidal conditions, the non-active power is the absolute value of the reactive power Q or the imaginary part of the complex power , thus .
Note 2 to entry: The coherent SI unit for non-active power is voltampere, VA. The special name "var" and its symbol "var" are also used. See 131-11-45.