conservation and dissipation of energy

Question 1

State the law of energy conservation

Answer 1

energy cannot be created or destroyed only can be transferred from one source to another

Question 2

What is waste energy?

Answer 2

The energy that is not used by the device
for its desired purpose.

Question 3

How can the efficiency of a system be increased?

Answer 3

1. Reducing waste output (by
   lubrication, thermal insulation etc.)
2. Recycling waste output (eg. recycling
   thermal waste energy as input energy)

Question 4

State the consequence for energy transfer of a
material with a high thermal conductivity.

Answer 4

The rate of energy transfer through the
material is higher than for a material with
a lower thermal conductivity.

Question 5

What key factors affect the rate of cooling of a
building?

Answer 5

● The thickness of the walls
● The thermal conductivity of the walls

Question 6

State three methods of reducing heat
loss in a building.

Answer 6

1. Double glazing
2. Loft and wall insulation
3. Thicker walls