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1.7 Energy, work and power

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Question 86

In a small hydroelectric power scheme, 1500 kg of water drops through a vertical height of 4.0 m every second. The electrical output is 41.2 kW.

What is the efficiency of the scheme?

A

0.70%0.70\%0.70%

B

14%14\%14%

C

70%70\%70%

D

85%85\%85%

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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