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3 Conservation of energy

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Question 57
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 Conservation of energy Questions

  1. GCSE
  2. /Physics
  3. /3 Conservation of energy

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