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Energy transfers

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Question 46

The diagram shows the percentage energy losses from a house.

A diagram of a house showing arrows representing percentage energy losses through different areas. The values are: 25% through the roof, 40% through the walls, 12% through the doors, 15% through the windows, and 8% through the floors.

a.

Most energy is lost through

  • A the floors
  • B the roof
  • C the walls
  • D the windows
[1]
b.

The total percentage energy loss from the roof and the floors is

  • A 15%
  • B 33%
  • C 40%
  • D 25%
[1]
c.

Insulating polyurethane foam is often used in the cavity walls of houses to reduce energy losses. The foam contains millions of tiny pockets of trapped air.

A cross-section diagram of cavity wall insulation foam showing a textured layer with many small circular bubbles representing trapped air. The upper boundary is labeled 'cold outer wall' and the lower boundary is labeled 'warm inner wall'.

Explain how this type of foam insulation reduces energy loss by conduction.

[2]
d.

Explain how this type of foam insulation reduces energy loss by convection.

[2]

Energy transfers Questions

  1. IGCSE
  2. /Physics
  3. /Energy transfers