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1.7 Energy, work and power

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Question 118

An electric pump provides 1400 J of useful output energy. The efficiency of the pump is 70%. How much electrical energy is supplied to the pump?

A

20 J20\text{ J}20 J

B

980 J980\text{ J}980 J

C

2000 J2000\text{ J}2000 J

D

9800 J9800\text{ J}9800 J

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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