Power and efficiency

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Question 13
Easy

An electric winch lifts a stone block from the ground to a height of 1.6 m. This lift takes a time of 8.0 s.

Use the data in the graph and table below to calculate the power needed to lift the block.

Graph showing change in gravitational potential energy (GPE) in J on the y-axis against height in m on the x-axis.

Height (m)Change in GPE (J)
0.4160
0.8320
1.2480
1.6640
2.0800

Use the equation:

power=ΔGPEtime \text{power} = \frac{\Delta GPE}{\text{time}} power=timeΔGPE​
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Power and efficiency Questions

  1. GCSE
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