Heat transfer and efficiency

Question 1

Forms of energy

Answer 1

magnetic
kinetic (movement energy)
heat (thermal energy)
light
gravitational potential
chemical
sound
electrical
elastic potential
nuclear.

Question 2

Energy transfer diagrams

Answer 2

Different types of energy can be transferred from one type to another. Energy transfer diagrams show each type of energy, whether it is stored or not, and the processes taking place as energy is transferred.

Question 3

Sankey diagrams

Answer 3

Sankey diagrams summarise all the energy transfers taking place in a process. The thicker the line or arrow, the greater the amount of energy involved.

Question 4

Efficiency

Answer 4

The efficiency of a device is the proportion of the energy supplied that is transferred in useful ways. You should be able to calculate the efficiency of a device as a decimal or as a percentage.