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1.7 Energy, work and power

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Question 39

The work done and the time taken by four machines are listed below:

  • Machine A: work done = 150 kJ150 \text{ kJ}150 kJ, time taken = 15 s15 \text{ s}15 s
  • Machine B: work done = 300 kJ300 \text{ kJ}300 kJ, time taken = 10 s10 \text{ s}10 s
  • Machine C: work done = 150 kJ150 \text{ kJ}150 kJ, time taken = 10 s10 \text{ s}10 s
  • Machine D: work done = 300 kJ300 \text{ kJ}300 kJ, time taken = 15 s15 \text{ s}15 s

Which machine is the most powerful?

[4]
Markscheme

1.7 Energy, work and power Questions

  1. IGCSE
  2. /Physics
  3. /1.7 Energy, work and power

533 exam-style questions on CIE IGCSE Physics 1.7 Energy, work and power, covering 1.7.1a Energy stores and energy transfers, 1.7.1b Conservation of energy, 1.7.1c Kinetic and gravitational potential energy, 1.7.2 Work done, 1.7.3 Energy resources, 1.7.3a Energy resources and electricity generation, 1.7.3b Nuclear fusion as an energy source, 1.7.3c Efficiency of energy transfer, and 1.7.4 Power. Each one has a worked solution and a mark scheme showing where the marks go.

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