Q.

If a current I given by  I0sin ω t−π2  flows in an ac circuit across which an ac potential of  E=E0sinω t has been applied, then the power consumption P in the circuit will be

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a

P=E0I02

b

P=2E0I0

c

P=E0I02

d

P = 0

answer is D.

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Detailed Solution

Phase angle φ=90o, so power P=Vicosφ=0
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If a current I given by  I0sin ω t−π2  flows in an ac circuit across which an ac potential of  E=E0sinω t has been applied, then the power consumption P in the circuit will be