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3.2 Dissipation and efficiency

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Question 16

During one operation, an electric air blower receives 1500 J. It transfers 900 J to the thermal store of the outgoing air and 450 J to the kinetic energy store of the outgoing air. The remaining energy is transferred to thermal stores in the blower and its surroundings.

For task P, the blower is used only to warm a surface. For task Q, it is used only to move dust from a surface.

Which gives the efficiency of the blower for each task?

[1]
A

task P 90%90\%90%; task Q 90%90\%90%

B

task P 40%40\%40%; task Q 70%70\%70%

C

task P 30%30\%30%; task Q 60%60\%60%

D

task P 60%60\%60%; task Q 30%30\%30%

Markscheme

3.2 Dissipation and efficiency Questions

  1. GCSE
  2. /Physics
  3. /3.2 Dissipation and efficiency

100 exam-style questions on Edexcel GCSE Physics 3.2 Dissipation and efficiency, covering 3.2.1 Dissipation of energy, 3.2.2 Reducing unwanted energy transfers, 3.2.3 Efficiency, and 3.2.4 Increasing efficiency. Each one has a worked solution and a mark scheme showing where the marks go.

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