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Question 20200
JEE Physics · Medium

Electromagnetic Induction and Alternating Current: Average Power in AC MCQ

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Average Power in ACMediumQuestion 20200

Question

Average power consumed in an AC circuit with V_rms, I_rms, and phase angle φ is:
  1. A
    V_rms × I_rms
  2. B
    V_rms × I_rms × sinφ
  3. C
    V_rms × I_rms × cosφ
    Correct
  4. D
    V₀I₀/2 × sinφ

Correct answer

V_rms × I_rms × cosφ

Explanation

P_avg = V_rms I_rms cosφ. The factor cosφ (power factor) accounts for the phase difference between voltage and current. For φ = 90° (pure L or C), P_avg = 0.

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