Heat Questions - GCSE Level

Q14. A householder wants to reduce her energy bills.

She collected information about a number of ways of reducing energy used.

The information is shown in in the table below:

Ways of reducing energy used	Cost to buy and install in £	Money saved per year in £
Install an energy-efficient boiler	2,000	320
Insulate the loft	400	200
Install double-glazed windows	12,000	120
Install cavity wall insulation	415	145

(a) Use the information in the table to compare the different ways of reducing the energy used.

Your answer should include some calculations.

[6 marks]

(b) Increasing the amount of insulation in a house affects the total U-value of the house.

(i) What is meant by the term 'U-value'?

[1 mark]

(ii) How is the U-value affected by increasing the amount of insulation?

[1 mark]

(8 marks total)