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1.7 Energy, work and power

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Question 263

A hydroelectric turbine is 24% efficient and has an output of 1.8 MW1.8\text{ MW}1.8 MW of electrical power.

What is the power input to the turbine?

A

0.43 MW0.43\text{ MW}0.43 MW

B

7.5 MW7.5\text{ MW}7.5 MW

C

4.3 MW4.3\text{ MW}4.3 MW

D

75 MW75\text{ MW}75 MW

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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