P 3 pf I V Where pf is the power factor I is the current V is the voltage and P is the power. The logarithm of quantity to a base b is written as log b. Therefore q m n.
P 3 x I 2 x R x Cos F.
The derivation of this formula is given on the Definition of the derivative page. The amount of power in a circuit at any instant of time is called the instantaneous power and is given by the well-known relationship of power equals volts times amps P VI. The standard metric unit of power is the Watt. Customize your course in 30 seconds.