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1.7 Energy, work and power

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Question 53

The power input to an electric motor is 800 W. The efficiency of the motor is 70%.

How much power is wasted?

A

240 W240\text{ W}240 W

B

70 W70\text{ W}70 W

C

560 W560\text{ W}560 W

D

870 W870\text{ W}870 W

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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