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Power and efficiency

Power and efficiency

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Question 10

An electric winch with an efficiency of 70% is used to raise a crate of mass 150 kg vertically at a constant speed of 0.8 m s-1.

Calculate the electrical power input to the winch.

(Take g=9.8 m s−2g = 9.8\text{ m s}^{-2}g=9.8 m s−2)

A

0.823 kW0.823\text{ kW}0.823 kW

B

1.176 kW1.176\text{ kW}1.176 kW

C

1.680 kW1.680\text{ kW}1.680 kW

D

2.625 kW2.625\text{ kW}2.625 kW

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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