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Physics (AS & A Level) · Oct / Nov 2025 · Paper 13 · Question 31

9702Potential difference and power

There is a potential difference V across a resistor of resistance R. The current in the resistor is I. Which equation gives the power P dissipated by the resistor?

  1. AP = V²I
  2. BP = V²/I
  3. CP = V²R
  4. DP = V²/R

As printed in the paper

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Correct answer: D. P = V²/R

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