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3.2 Dissipation and efficiency

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Question 8

An automatic sliding door is 80% efficient. Each time the door opens, 50 J of energy is dissipated.

How much of the energy supplied becomes the useful output?

[1]
A

200 J200\ \mathrm{J}200 J

B

62.5 J62.5\ \mathrm{J}62.5 J

C

40 J40\ \mathrm{J}40 J

D

250 J250\ \mathrm{J}250 J

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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