Paper 1: Efficent Heat Transfer

Question 1

What does the efficiency of a device measure?

Answer 1

How much useful energy is transferred

Question 2

What does the rate at which thermal energy transfer through a wall of a house depend on?

Answer 2

The difference in temperature between the warmer interior and the colder exterior
The material the wall is made from

Question 3

What the equation for efficiency?

Answer 3

Efficiency = useful energy transferred by the machine / total energy supplied to the machine