STANDARDPhysics-Alternating Current
STANDARD Physics Power in AC Circuits MCQ Question
Type: MCQ-conceptual-Medium-Class 12
In an ac circuit, V and I are given by V = 150sin(150t)V and I = 150sin(150t + π/3) A. The power dissipated in the circuit is
A
106 W
B
150 W
C
5625 W
D
zero
Correct Answer
Option C
Detailed Explanation
The power dissipated in an AC circuit is given by P = VIcosϕ, where ϕ is the phase difference between voltage and current. Here, ϕ = π/3, V = 150 V, and I = 150 A. Therefore, P = 150 × 150 × cos(π/3) = 5625 W.
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