AIPMT PRELIMS2008Physics-Alternating Current
AIPMT PRELIMS 2008 Physics Power in AC Circuits MCQ Question
Type: MCQ-conceptual-Medium-Class 12
In an A.C. circuit the emf (e) and the current (i) at any instant are given respectively by : e = E₀ sin ωt i = I₀ sin (ωt − ϕ) The average power in the circuit over one cycle of A.C. is -
A
E₀I₀/2 cos ϕ
B
E₀I₀
C
E₀I₀/2
D
E₀I₀/2 sin ϕ
Correct Answer
Option A
Detailed Explanation
The average power in an AC circuit is given by P_avg = (E₀I₀/2) cos ϕ, where ϕ is the phase difference between the voltage and the current.
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