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Power and efficiency

Power and efficiency

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Question 7

A gas-fired power station has an efficiency of 0.45.

What is the input energy needed to obtain a useful output energy of 900 MJ900\text{ MJ}900 MJ?

Use the equation:

efficiency=useful output energy transferinput energy transfer \text{efficiency} = \frac{\text{useful output energy transfer}}{\text{input energy transfer}} efficiency=input energy transferuseful output energy transfer​
A

405 MJ405\text{ MJ}405 MJ

B

900 MJ900\text{ MJ}900 MJ

C

1350 MJ1350\text{ MJ}1350 MJ

D

2000 MJ2000\text{ MJ}2000 MJ

Markscheme

Power and efficiency Questions

  1. GCSE
  2. /Physics
  3. /Power and efficiency

37 exam-style questions on OCR GCSE Physics Power and efficiency. Each one has a worked solution and a mark scheme showing where the marks go.

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