Machine Efficiency and Energy Input

00:00 1 marks

A machine has an efficiency of 60%. If the useful work output is 300 J, what is the total energy input?

A

180 J
B

300 J
C

480 J
D

500 J

Hint Hint

Hint

Recall that efficiency is calculated as (useful work output)/(total energy input). Rearranging gives energy input = useful work output ÷ efficiency.

Answer Answer
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Explanation Explanation
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Answer Answer

Complete Answer

500 J

Mark Scheme Mark Scheme

Answer Explanation Answer Explanation

Examiner Tips Examiner Tips

Common Errors Common Errors

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