The instantaneous value of alterninig voltage is given by E = 140 sin 300 t. what is rms value of voltage and frequency of supply ?
Take `pi = 3` and `sqrt2 = 1.4`.

Explanation

Here, `E = 140 sin 300 t`. Compare with
`E = E_(0) sin omega t`
`E_(0) = 140 V, E_(v) = (E_(0))/(sqrt2) = (140)/(1.4) = 100 V`
`omega = 300 , 2 pi v = 300, v = (3000)/(2 pi) = (300)/(2 xx 3) = 50 Hz`