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1.7 Energy, work and power

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Question 402

An electric motor is described as being highly efficient.

Which statement correctly explains what this means?

A

It operates at a very high speed.

B

It transfers most of its input energy into useful output energy.

C

It requires very little input power to operate.

D

It stores most of its input energy as gravitational potential energy.

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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