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3.2 Dissipation and efficiency

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Question 21
F

An electric kettle receives 120 kJ of energy. The water gains 96 kJ and the kettle gains 12 kJ. The remaining energy is transferred to the room.

Only heating the water is useful.

Which gives the efficiency and the energy transferred to the room?

[1]
A

efficiency 80%80\%80%; energy 24 kJ24\ \mathrm{kJ}24 kJ

B

efficiency 80%80\%80%; energy 12 kJ12\ \mathrm{kJ}12 kJ

C

efficiency 90%90\%90%; energy 12 kJ12\ \mathrm{kJ}12 kJ

D

efficiency 90%90\%90%; energy 24 kJ24\ \mathrm{kJ}24 kJ

Markscheme

3.2 Dissipation and efficiency Questions

  1. GCSE
  2. /Physics
  3. /3.2 Dissipation and efficiency

100 exam-style questions on Edexcel GCSE Physics 3.2 Dissipation and efficiency, covering 3.2.1 Dissipation of energy, 3.2.2 Reducing unwanted energy transfers, 3.2.3 Efficiency, and 3.2.4 Increasing efficiency. Each one has a worked solution and a mark scheme showing where the marks go.

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