Skip to content

Course home

Sign up

8.3 Power and efficiency

EasyMediumHard
12345678910111213141516171819202122232425262728293031323334353637
Question 37
F

A motor lifts a load. Its bearings are lubricated, reducing friction. The useful work done is unchanged. Which change is expected?

[1]
A

Less energy is dissipated, so less input energy is needed.

B

More energy is dissipated, so more input energy is needed.

C

Less energy is dissipated, so more input energy is needed.

D

More energy is dissipated, so less input energy is needed.

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