Skip to content

Course home

1.2 Conservation and dissipation of energy

1.2 Conservation and dissipation of energy

EasyMedium
12345678910111213141516171819202122232425
Question 16

A deep-space probe's emergency power recovery systems are being evaluated. Engineers are comparing two methods of auxiliary energy storage to support the scientific instrumentation during a main reactor outage:

  • System P (Pneumatic Storage): Compressing gas in high-pressure tanks.

    • Energy stored per 50 kg50\text{ kg}50 kg of system mass = 18,400 kJ18,400\text{ kJ}18,400 kJ
    • Percentage of stored energy dissipated as heat (wasted) = 32%32\%32%

  • System Q (Electrochemical Storage): Charging high-density lithium-sulfur batteries.

    • Energy stored per 50 kg50\text{ kg}50 kg of system mass = 24,500 kJ24,500\text{ kJ}24,500 kJ
    • Percentage of stored energy lost due to internal resistance (wasted) = 18%18\%18%

Calculate the difference in the useful energy retrieved (in kJ\text{kJ}kJ) from 50 kg50\text{ kg}50 kg of storage mass between System Q and System P.

[6]
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.

Question bank