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1.7.1a Energy stores and energy transfers

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Question 38

An electrical machine has a power input of 300 W and provides a useful output energy of 2.7 kJ over a duration of 5 minutes5\text{ minutes}5 minutes.

What is the efficiency of the machine?

A

0.030%0.030\%0.030%

B

0.18%0.18\%0.18%

C

3.0%3.0\%3.0%

D

18%18\%18%

Markscheme

1.7.1a Energy stores and energy transfers Questions

  1. IGCSE
  2. /Physics
  3. /1.7.1a Energy stores and energy transfers

229 exam-style questions on CIE IGCSE Physics 1.7.1a Energy stores and energy transfers. Each one has a worked solution and a mark scheme showing where the marks go.

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