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Physics (AS & A Level) · May / June 2018 · Paper 11 · Question 31

9702Potential difference and power

The circuit diagrams show two lamps X and Y each connected to a cell. The current in lamp X is 0.50 A and its resistance is 9.6 Ω. The current in lamp Y is 3.0 A and its resistance is 1.2 Ω. What is the ratio power in lamp X / power in lamp Y?

  1. A0.22
  2. B0.75
  3. C1.3
  4. D4.5

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Correct answer: A. 0.22

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