Energy stores, transfers and conservation

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Question 40
Easy

An electric winch system transfers 9600 J of useful gravitational potential energy to a crate being lifted in 45 seconds45\text{ seconds}45 seconds.

Figure 1 shows a diagram of the energy transfers.

Sankey diagram showing an input of 12000 J of electrical energy on the left, splitting into 9600 J of useful gravitational potential energy flowing to the right and 2400 J of wasted energy pointing downwards.

Explain why the useful energy transferred to the crate is different from the total electrical energy supplied to the winch.

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Energy stores, transfers and conservation Questions

  1. GCSE
  2. /Physics
  3. /Energy stores, transfers and conservation