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1.7 Energy, work and power

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Question 272

An electric motor is described as being highly efficient.

What does this mean?

A

It transfers a large proportion of total input energy into useful kinetic energy.

B

It uses an extremely small amount of total electrical energy.

C

It produces a large amount of wasted thermal energy.

D

It rotates at a very high speed.

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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