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10.4 Mains electricity

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Question 2

An electric wax melter has two power settings. It operates at 1.2 kW for 3.0 min before its power is reduced to 0.80 kW.

The wax must gain 450 kJ of energy during the complete process. A further 30 kJ of the electrical energy supplied heats the casing and the room. All the electrical energy supplied is accounted for by these energy transfers.

Calculate the time for which the melter must operate at 0.80 kW.

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Markscheme

10.4 Mains electricity Questions

  1. GCSE
  2. /Physics
  3. /10.4 Mains electricity

81 exam-style questions on Edexcel GCSE Physics 10.4 Mains electricity, covering 10.4.1 Direct and alternating current, 10.4.2 Live, neutral and earth wires; safety, 10.4.3 Mains wire potential differences and dangers, and 10.4.4 Power ratings and energy use. Each one has a worked solution and a mark scheme showing where the marks go.

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