# Peak Factor

**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 mean 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:

Where,

I_{m} and E_{m} are the maximum value of the current and the voltage respectively, and I_{r.m.s }and E_{r.m.s }are the roots mean square value of the alternating current and the voltage respectively.

For the current varying sinusoidally, the peak factor is given as:

The value of Peak Factor is **1.4142**

## 5 Comments

Give examples for calculating peak factor for rectangular wave shapes

Give examples for calculating peak factor for rectangular wave shapes

for rectangular wave peak factor will be one because the peak value of rectangular wave is 1 and rms value is also one means there is no peak in the rectangular waveform.

Can form facter be infinite

That is can average current be 0?

Yes, Average Current can be zero… Infact it is zero for alternating current which made it through one complete cycle

But the form factor can’t be infinite because for the average current taken into consideration is for half cycles… NOT complete cycles..

Have a nice day.