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3 Conservation of energy

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Question 50
F

The Figure shows a cross-section through the outside wall of a house.

Figure

image

The owner of the house has the cavity filled with foam insulation.

a.

Explain how filling the cavity with foam insulation reduces the rate of cooling of the house.

[2]
b.

Before the cavity was filled, the heating system supplied 45 000 MJ45\,000\ \text{MJ}45000 MJ of energy each year to keep the house warm.

After the cavity was filled, the heating system supplied 36 000 MJ36\,000\ \text{MJ}36000 MJ of energy each year.

Calculate the percentage decrease in the energy supplied each year.

[2]
c.

Give two other ways the owner could reduce the rate of energy transfer from the house.

[2]
d.

The owner says:

'Now that the cavity is filled, my heating system is more efficient.'

Explain why the owner is wrong.

[2]
Markscheme

3 Conservation of energy Questions

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

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