JEE Plances Class Answered
If frequency of the source e.m.f in AC circuit is n, the power varies with a frequency:
Asked by sudheerkapoor67 | 04 Oct, 2017, 19:39: PM
Expert Answer
The average power in AC circuit is given by
Pavg = VI cos φ
where
V = vo sin wt
I = io sin wt
Therefore,
P = vo io sin2 wt cosφ
P = vo io sin2 (2 π f t) cosφ ... as w = 2πf
Now substituting the value of frequency f=n as given,
the relationship changes to
P = vo io sin2 (2 π n t) cosφ
Answered by Abhijeet Mishra | 05 Oct, 2017, 15:40: PM
