Power attained in an AC circuit as a product of effective voltage and current which reach their peak at different times.
Measured in VA and is used in AC circuits when the load is not purely resistive having an inductive or capacative nature.
That power apparently available for use in an ac circuit containing a reactive element. It is the product of effective voltage times effective current expressed in volt-amperes. It must be multiplied by the power factor to obtain true power available.