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1.2 Conservation and dissipation of energy

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Question 13

A microwave oven has a total power input of 1.2 kW. It is used to warm a meal for 50 s, transferring 21 kJ of energy usefully to the food.

Calculate the efficiency of the microwave oven as a percentage.

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Markscheme

1.2 Conservation and dissipation of energy Questions

  1. GCSE
  2. /Physics
  3. /1.2 Conservation and dissipation of energy

104 exam-style questions on AQA GCSE Physics 1.2 Conservation and dissipation of energy, covering 1.2.1 Energy transfers in a system and 1.2.2 Efficiency. Each one has a worked solution and a mark scheme showing where the marks go.

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