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1.7 Energy, work and power

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Question 428

An electrical appliance is described as having a very high efficiency. What does this mean?

A

It transfers a high percentage of its input energy into useful energy.

B

It requires very little input power to operate.

C

It transfers almost all of its input energy into wasted thermal emissions.

D

It creates more energy than the total energy input.

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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