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1.7 Energy, work and power

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Question 81

An electric water pump transfers 450 kJ of useful energy in 2.5 minutes2.5\text{ minutes}2.5 minutes. What is the average useful power output of the pump?

A

3.0 kW3.0\text{ kW}3.0 kW

B

180 kW180\text{ kW}180 kW

C

1125 kW1125\text{ kW}1125 kW

D

67 500 kW67\,500\text{ kW}67500 kW

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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