Question
In an AC circuit, the emf (e) and the current (i) at any instant are given respectively by
e = E0 sin ωt
i = Io sin (ωt -Φ)
The average power in the circuit over one cycle of AC is
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EoIo
Solution
C.
The power is defined as the rate at which work is being done in the circuit.
Power = rate of work done in one complete cycle.
Or
Pav = W/T
where cos Φ is called the power factor of an AC circuit.
