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1.7 Energy, work and power

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Question 74

An electric winch is used to lift a package.

a.

The weight of the package is 25 N25\text{ N}25 N. The package is raised vertically through a distance of 1.6 m1.6\text{ m}1.6 m.

Calculate the work done on the package.

[2]
b.

Describe one way in which energy is wasted by the electric winch as it lifts the package.

[1]
c.

A wind turbine generates electrical power using the energy of wind.

Describe how a wind turbine generates electrical power from the wind.

[3]
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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