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1.7 Energy, work and power

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Question 315

Electricity is distributed from hydroelectric dams to homes and industry.

a.

Statements A–F describe the main stages in the transfer of energy from the Sun to electrical energy in a hydroelectric power station. The statements A–F are not in the correct order.

  • A: Water vapour condenses and falls as rain on high ground, where it is collected in a reservoir.
  • B: The turbine turns a generator.
  • C: Energy from the Sun heats water in oceans and lakes, causing it to evaporate.
  • D: Water stored in the reservoir has gravitational potential energy.
  • E: The generator generates electrical energy.
  • F: Water flowing down the pipes turns a turbine.

Complete the flow chart to describe how a hydroelectric scheme uses energy from the Sun to generate electrical energy. Insert the missing letters in the empty boxes.

A↓A↓D↓A↓A↓A \begin{gathered} \boxed{\quad\phantom{\text{A}}\quad} \\ \downarrow \\ \boxed{\quad\text{A}\quad} \\ \downarrow \\ \boxed{\quad\text{D}\quad} \\ \downarrow \\ \boxed{\quad\phantom{\text{A}}\quad} \\ \downarrow \\ \boxed{\quad\phantom{\text{A}}\quad} \\ \downarrow \\ \boxed{\quad\phantom{\text{A}}\quad} \end{gathered} A​↓A​↓D​↓A​↓A​↓A​​
[4]
b.

State two disadvantages, apart from cost, of using hydroelectric power stations to produce electrical energy for homes and industry.

[2]
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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