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3 Conservation of energy

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Question 104

H

A device operates in two stages. The table shows the input energy and efficiency for each stage.

Stage	Input energy in $J\mathrm{J}$	Efficiency
P	200	80%
Q	800	50%

The stages receive energy separately from the supply.

What is the efficiency for the complete operation?

[1]

A

$40%40\%$

B

$65%65\%$

C

$56%56\%$

D

$74%74\%$

Markscheme

3 Conservation of energy Questions

GCSE
Physics
3 Conservation of energy

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