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Power and efficiency

Power and efficiency

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Question 1

A water pump operates with an efficiency of 75%. It is used to raise water from a well of depth 15 m and discharge it at ground level through a pipe at a speed of 12 m s-1. The pump delivers water at a constant rate of 20 kg s-1.

Taking g=9.8 m s−2g = 9.8\text{ m s}^{-2}g=9.8 m s−2, what is the minimum electrical power input required by the pump?

A

3.29 kW3.29\text{ kW}3.29 kW

B

3.92 kW3.92\text{ kW}3.92 kW

C

5.84 kW5.84\text{ kW}5.84 kW

D

4.38 kW4.38\text{ kW}4.38 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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