Reducing Unwanted Energy Transfers

Thermal conductivity is a measure of how easily heat energy passes through a material.

• True

• False

The main method of heat transfer in solids is...

• conduction

• convection

• radiation

Insulators, such as air, have a __________ thermal conductivity.

To reduce unwanted energy energy loss in a house, you can build __________ walls.

Double glazing reduces heat loss through...

• conduction

• convection

• radiation

In a fan, wasted heat energy is produced by moving parts because of __________.

To reduce friction between moving parts, you can use a __________, such as oil.

Loft insulation reduces heat loss through...

• conduction

• convection

• radiation