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3 Conservation of energy

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Question 72
F

An electric kettle is used to bring some water to the boil.

The Figure is an incomplete energy transfer diagram for the kettle for each second it is switched on.

Figure

image

a.

Determine the energy transferred to the thermal energy store of the surroundings each second.

[1]
b.

Explain how the energy transfer diagram shows that energy is conserved.

[2]
c.

The kettle is switched on for 150 s.

Calculate the total energy transferred to the thermal energy store of the water in this time.

[2]
d.

A student says that the energy transferred to the surroundings has been destroyed.

Explain why the student is wrong.

[2]
Markscheme

3 Conservation of energy Questions

  1. GCSE
  2. /Physics
  3. /3 Conservation of energy

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