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1. Explain why using energy-saving bulbs is more efficient than normal bulbs.
2. How is
the payback time of installation of different heat insulations calculated?
3. Complete
the following table:
|
Type of insulation |
Cost
(£) |
Annual
saving (£) |
Payback
time |
|
Double glazing |
5000 |
50 |
|
|
Loft insulation |
300 |
60 |
|
|
Cavity wall insulation |
600 |
|
6
years |
|
Draught-proofing |
50 |
|
1
year |
a) Which type of heat insulation pays for itself quickly?
b) Is double glazing a cost effective method of heat insulation? explain.
c) What is the most effective method of heat insulation? explain.
d) How Science Works
The type of
insulation affects the amount of heat loss from a house.
What kind of variable is the type of insulation?
4. List
three advantages of saving energy.
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