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8 Energy – forces doing work

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Question 53
F

The Figure shows a Sankey diagram for an electric kettle.

Figure

image

a.

Determine the energy that the width of one square represents.

[1]
b.

Calculate the energy usefully transferred to the thermal store of the water.

[2]
c.

Explain how the Sankey diagram shows that energy is conserved.

[2]
d.

Give the energy transfer pathway

  • from the mains supply to the kettle

  • from the heating element to the water.

[2]
e.

A different kettle transfers the same amount of energy to the thermal store of the water.

This kettle wastes a total of 60 J.

Calculate the total energy supplied to this kettle.

[2]
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8 Energy – forces doing work Questions

  1. GCSE
  2. /Physics
  3. /8 Energy – forces doing work

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