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1.2 Conservation and dissipation of energy

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Question 23

A battery-powered fan operates inside a well-insulated test chamber. Energy is transferred from the chemical store of the battery to the kinetic store of the fan and to the thermal stores of the fan, air and chamber.

A scientist considers two possible system boundaries:

  • system P contains only the battery and fan
  • system Q contains the battery, fan, air and chamber

The table shows the change in the total energy within each system boundary since the fan was switched on.

Time in sChange in total energy of system P in JChange in total energy of system Q in J
25−1250
50−2500

Explain which system should be treated as a closed system. Predict the change in the total energy of this system between 0 s and 100 s if the system boundaries do not change.

[3]
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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