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1.7 Energy, work and power

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Question 3

Two electric heaters, P P\,P and QQQ, are used to heat the same mass of water through the same increase in temperature.

Heater P P\,P is more efficient than heater QQQ.

Which statement about the heaters is correct?

A

The useful energy output of heater PPP is larger than that of heater QQQ.

B

The useful energy output of heater PPP is smaller than that of heater QQQ.

C

The electrical energy input to heater PPP is larger than that to heater QQQ.

D

The electrical energy input to heater PPP is smaller than that to heater QQQ.

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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