Energy Efficiency

Question 0

Give five ways that you can insulate your home.

Answer 0

1. Cavity wall insulation
2. Loft insulation
3. Hot water tank jacket
4. Double glazing
5. Draught proofing

Question 1

True or False. At the moment all objects have the potential to be 100% efficient.

Answer 1

False. No object can be 100% efficient as some energy is always lost as heat.

Question 2

How do you work out the payback time?

Answer 2

Payback time= Initial cost / Annual saving

Question 3

What do u-values show?

Answer 3

U-values show how fast heat can transfer through a material.

Question 4

Will a good insulater have a high or a low u-value? Why?

Answer 4

A good insulator will have a low u-value because heat transfers slower through a material with a lower u-value.

Question 5

What is the units for u-values?

Answer 5

W/m²K

Question 6

What is the specific heat capacity formula triangle? What does each letter/symbol stand for?

Answer 6

E=energy M=mass C=specific heat capacity Ø=temperature change

Question 7

Sarah says that her telly wastes some energy and it gets destroyed but Jim says that the energy gets transferred to the surroundings. Who is correct? Why?

Answer 7

Jim is correct. Energy can’t be created or destroyed only transferred.