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Physics (AS & A Level) · May / June 2023 · Paper 12 · Question 31

9702Potential difference and power

A resistor of resistance R is connected across a cell of electromotive force (e.m.f.) E and negligible internal resistance. Which single change to the circuit would lead to the largest increase in the power dissipated in the resistor?

  1. Adoubling the value of E
  2. Bdoubling the value of R
  3. Chalving the value of E
  4. Dhalving the value of R

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Correct answer: A. doubling the value of E

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