POWER FACTOR

the cosine value of angle between voltage and current which decide

ratio between real power and apparent power.

The power factor of an AC electrical power system is defined as the ratio of the real power flowing to the load to the apparent power in the circuit,^[1][2] and is a dimensionless number between 0 and 1. Real power is the capacity of the circuit for performing work in a particular time. Apparent power is the product of the current and voltage of the circuit. Due to energy stored in the load and returned to the source, or due to a non-linear load that distorts the wave shape of the current drawn from the source, the apparent power will be greater than the real power.

http://en.wikipedia.org/wiki/Power_factor

the power factor defines: 1) the cosine of the angle between current and voltage vector is called power factor.

2) it is that multiplying factor by which if we multiply the total power to get real/active power

3) it is the ratio of active power to total power, resistance to impedance...

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