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JEE Physics · Medium

Current Electricity: Maximum Power Transfer MCQ

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Maximum Power TransferMediumQuestion 31628

Question

Maximum power is delivered to external resistance R_ext when:
  1. A
    R_ext = 0
  2. B
    R_ext = r (internal resistance)
    Correct
  3. C
    R_ext → ∞
  4. D
    R_ext = 2r

Correct answer

R_ext = r (internal resistance)

Explanation

P_ext = I²R_ext = E²R_ext/(R_ext+r)². Differentiating and setting to zero gives R_ext = r for maximum power.

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