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1.7 Energy, work and power

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Question 212

An electric motor does 380 000 J380\,000\text{ J}380000 J of work to lift a heavy crate to the top of a scaffolding. It takes 5 minutes5\text{ minutes}5 minutes to lift the crate.

What is the average power of the motor?

A

1.3 kW1.3\text{ kW}1.3 kW

B

76 kW76\text{ kW}76 kW

C

1900 kW1900\text{ kW}1900 kW

D

114 000 kW114\,000\text{ kW}114000 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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