Asked in PMC Practice Test 1 (2021) 2021

Maximum power delivered by a battery is?

Correct answer: A. Pmax = E2/4r

  • A. Pmax = E2/4r
  • B. Pmax = 4rE2
  • C. Pmax =VIT
  • D. Unlimited

Explanation

Factual recall from PTB. See explanation attached.

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About Maximum Power Output

Maximum power output describes the condition in which a source with internal resistance delivers the greatest power to an external load. The topic uses P = I²R and related circuit equations to show that maximum power occurs when load resistance equals internal resistance. This differs from maximum efficiency, which occurs under a separate condition.

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