Question

by who many times the polarity of the current changes in one sec.

Answer 1

F = 50,

T=1/F,T=1/F,

T=1/50,T=1/50,

T=0.02secondT=0.02second

It means, in 0.02 second one cycle is complete.

In one cycle 2 time AC change its polarity.

So, 1/0.02=501/0.02=50

And 50∗2=10050∗2=100

So 50 Hz AC change its polarity is 100 time.

In other word 50Hz means in a one second 50 cycle is complete.

And in AC 1 cycle 2 time polarity change

Total 50∗2=10050∗2=100

So, 50Hz AC change its polarity in 1 second is 100 time.

Thank you