P3

Question 1

Give examples of renewable energy sources…

Answer 1

• solar cells
• tidal power
• bio-fuels
• hydroelectricity
• wind turbines

Question 2

The rate at which thermal energy is transferred through a wall of a house depends on what?

Answer 2

• the difference in temperature between the warmer interior and colder exterior
• the thickness of the walls
• the material that the walls are made from