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1.7 Energy, work and power

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Question 53

The kinetic energy of air passing through a wind turbine every minute is 1 200 000 J1\,200\,000\text{ J}1200000 J. The electrical output of the turbine is 12 A12\text{ A}12 A at a potential difference (p.d.) of 250 V250\text{ V}250 V.

Calculate the efficiency (%) of the wind turbine.

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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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