Definition: Peak Factor is defined as the ratio of maximum value to the R.M.S value of an alternating quantity. The alternating quantities can be voltage or current. The maximum value is the peak value or the crest value or the amplitude of the voltage or current.
The root means the square value is the amount of heat produced by the alternating current will be same when the direct supply of current is passed through the same resistance in the same given time.
Mathematically it is expressed as