Power and efficiency

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Question 8
Medium

An electric winch is used to lift a rescue capsule vertically up a mine shaft.

The work done by the winch in raising the capsule is 254 800 J254\,800\text{ J}254800 J.

The winch operates at a constant power of 1.82 kW.

Calculate the time, t t\,t in seconds, it takes to raise the capsule.

Use the equation:

P=Wt P = \frac{W}{t} P=tW​

where P P\,P is the power in watts (W\text{W}W), W W\,W is the work done in joules (J\text{J}J), and t t\,t is the time in seconds (s\text{s}s).

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Power and efficiency Questions

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