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1.7 Energy, work and power

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Question 88

The following statements describe what happens when the power of a machine is decreased:

  1. The work done in a given time decreases.
  2. The work done in a given time increases.
  3. The time taken to do a given quantity of work decreases.
  4. The time taken to do a given quantity of work increases.

Which statements are correct?

A

1 and 3

B

1 and 4

C

2 and 3

D

2 and 4

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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