Energy Transfers
3 marks · EasyA student is asked to explain how a woolly jumper helps to keep you warm on a cold day.
Name the process by which heat would escape without a jumper.
Describe how the wool reduces heat loss.
Name another common household use of a similar insulating principle.
Work this out on paper, then compare with the answer and worked solution below. With a free account you can submit written answers for marking.
Show answer
(a) Conduction (and convection)
(b) Wool traps air, which is a poor conductor and reduces heat loss.
(c) Loft insulation in roofs (or double glazing).
Show mark scheme and worked solution
Marking points
B1 (a) · 1 mark · Names conduction and/or convection as the process of heat transfer.
B1 (b) · 1 mark · Explains that wool traps air, reducing conduction.
B1 (c) · 1 mark · Identifies a household parallel, such as loft insulation or double glazing.
Worked solution
a. Conduction (and convection).
b. Wool traps air, which is a poor conductor of heat, so less heat escapes.
c. Loft insulation in roofs uses the same principle.