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Question 20198
JEE Physics · Medium

Electromagnetic Induction and Alternating Current: Power Factor MCQ

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Power FactorMediumQuestion 20198

Question

Power factor of an AC circuit is defined as:
  1. A
    R/Z
    Correct
  2. B
    Z/R
  3. C
    X_L/R
  4. D
    (X_L−X_C)/Z

Correct answer

R/Z

Explanation

Power factor PF = cos φ = R/Z. Average power P = V_rms I_rms cos φ. For pure R: PF = 1. For pure L or C: PF = 0 (no average power consumed).

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