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1.2 Conservation and dissipation of energy

1.2 Conservation and dissipation of energy

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Question 4

Two methods of storing surplus electricity from a wind farm are being compared:

  • Method A (Thermal Storage): Heating a specialized storage medium.

    • Energy stored per 100 kg100\text{ kg}100 kg of medium = 40,000 kJ40,000\text{ kJ}40,000 kJ
    • Percentage of stored energy wasted = 35%35\%35%

  • Method B (Gravitational Storage): Pumping mass up a vertical shaft.

    • Energy stored per 100 kg100\text{ kg}100 kg of mass = 800 kJ800\text{ kJ}800 kJ
    • Percentage of stored energy wasted = 15%15\%15%

Calculate the difference in the useful energy retrieved (in kJ\text{kJ}kJ) from 100 kg100\text{ kg}100 kg of storage material between Method A and Method B.

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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

26 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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