Define power factor, what are the maximum and minimum values of power factor

Explanation

It is defined as the ration of true power to the apparent power of an a.c circuit. It is equal to the cosine of the phase angle between current and voltage in the a.c circuit.
It is given by
`cosphi=("Toue power")/("Apparent power")`
`=(P_("avearage"))/(V_(ms)-I_(ms))`