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8.3 Power and efficiency

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Question 59

A machine does useful work $E\,$ in time $t$ . A second machine does $1.5E\,$ of useful work in time $0.60 t$ . What is the ratio of the useful power of the second machine to that of the first?

[1]

$0.90$

$2.50$

$1.90$

$0.40$

Markscheme

8.3 Power and efficiency Questions

GCSE
Physics
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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