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8.3 Power and efficiency

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Question 4

During one opening, an automatic door mechanism receives 2500 J of electrical energy. Of this energy, 500 J is dissipated in unwanted transfers. What is the efficiency of the door mechanism?

[1]
A

0.830.830.83

B

0.800.800.80

C

0.200.200.20

D

0.250.250.25

Markscheme

8.3 Power and efficiency Questions

  1. GCSE
  2. /Physics
  3. /8.3 Power and efficiency

128 exam-style questions on Edexcel GCSE Physics 8.3 Power and efficiency, covering 8.3.1 Power and 8.3.2 Efficiency. Each one has a worked solution and a mark scheme showing where the marks go.

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