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Power and efficiency

Power and efficiency

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Question 1

An electric winch with an efficiency of 70% is used to lift a crate of mass 80 kg vertically upwards at a constant speed of 1.25 m s-1.

Calculate the electrical input power of the winch.

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

A

0.69 kW0.69\text{ kW}0.69 kW

B

0.98 kW0.98\text{ kW}0.98 kW

C

1.4 kW1.4\text{ kW}1.4 kW

D

2.0 kW2.0\text{ kW}2.0 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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