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Physics (AS & A Level) · May / June 2017 · Paper 13 · Question 32

9702Potential difference and power

The diagram shows a portable generator connected by cables to floodlights. The generator produces a current of 10 A at a constant potential difference (p.d.) of 240 V. The total resistance of the cables is 2 Ω. What is the p.d. V across, and the power P delivered to, the floodlights?

  1. AV = 220 V, P = 2000 W
  2. BV = 220 V, P = 2200 W
  3. CV = 230 V, P = 2000 W
  4. DV = 230 V, P = 2300 W

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Correct answer: B. V = 220 V, P = 2200 W

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