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# If frequency of the source e.m.f in AC circuit is n, the power varies with a frequency:

Asked by sudheerkapoor67 4th October 2017, 7:39 PM
Answered by 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  i 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  i sin2 (2 π n t) cosφ

Answered by Expert 5th October 2017, 3:40 PM
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