Skip to content

Course home

Sign up

8.3 Power and efficiency

EasyMediumHard
123456789101112131415161718192021222324
Question 8

In one use, an electric sander transfers 600 J of energy usefully. In the same time, 300 J heats the motor and the surrounding air, and 100 J is transferred to the surroundings as sound. What is the efficiency of the sander?

[1]
A

0.600.600.60

B

0.860.860.86

C

0.670.670.67

D

0.400.400.40

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.

Question bank