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1.7 Energy, work and power

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Question 257

Two solar power plants supply electrical energy to a regional grid in different ways.

Solar plant A supplies energy directly to the grid. For every 1000 kJ of solar energy incident on the panels, 220 kJ is transferred to the grid as electrical energy.

Solar plant B stores electrical energy in a large battery storage facility and then supplies energy from the batteries to the grid. For every 1000 kJ of solar energy incident on the panels, 150 kJ is transferred to the grid as electrical energy.

Which statement about the two solar plants is correct?

A

Solar plant A is more reliable and more efficient than solar plant B.

B

Solar plant A is more reliable but less efficient than solar plant B.

C

Solar plant A is less reliable and less efficient than solar plant B.

D

Solar plant A is less reliable but more efficient than solar plant B.

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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