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Physics (AS & A Level) · May / June 2018 · Paper 12 · Question 32

9702Potential difference and power

The power output of an electrical supply is 2.4 kW at a potential difference (p.d.) of 240 V. The two wires between the supply and a kettle each have a resistance of 0.50 Ω, as shown. What is the power supplied to the kettle and what is the p.d. across the kettle?

  1. Apower / kW: 2.3, p.d. / V: 230
  2. Bpower / kW: 2.3, p.d. / V: 235
  3. Cpower / kW: 2.4, p.d. / V: 230
  4. Dpower / kW: 2.4, p.d. / V: 235

As printed in the paper

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Correct answer: A. power / kW: 2.3, p.d. / V: 230

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