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Edexcel GCSE Physics Heat energy

Heat energy

This page covers the following topics:

1. Energy conduction
2. Energy convection
3. Radiation
4. Energy loss in buildings
5. Energy loss for living things

Conduction is the flow of heat through solids and through direct contact of objects, such as a pan on a cooker.

Energy conduction

Convection is able to occur in fluids (liquids and gases). As the fluid is heated it creates a convection current, which is illustrated in the diagram.

Energy convection

Radiation is the transfer of energy by electromagnetic radiation or waves.

Radiation

Trapped air is used in a number of ways to help to insulate the home. In cold climates such as the UK this allows heat to be kept in the house during cold weather, but in hotter countries it is used to keep houses cool in the summer.

Energy loss in buildings

Many different types of animals have adapted for their own climates and habitats using a range of features. Its important to know a few examples of animal adaptions for both hot and cold climates.

Energy loss for living things

1

Often a material such as polymer foam or mineral wool is used to fill the gap in cavity walls. What advantage is this over air alone?

Often a material such as polymer foam or mineral wool is used to fill the gap in cavity walls. What advantage is this over air alone?

2

How are camels adapted to live in extremely hot climates?

How are camels adapted to live in extremely hot climates?

3

3 spoons are put in hot water, one is wood, one is plastic and the other one is metal. After being in the water for 5 minutes which of the spoon handles will be hot and which will be cold? Explain your answer.

3 spoons are put in hot water, one is wood, one is plastic and the other one is metal. After being in the water for 5 minutes which of the spoon handles will be hot and which will be cold? Explain your answer.

4

In which of the following materials can a convection current be created?
A) wood
B) water
C) air
D) aluminium

In which of the following materials can a convection current be created? 
A) wood
B) water 
C) air 
D) aluminium

5

In cold weather to preserve body heat it is important to wear multiple layers. Using the diagram explain why it is better to wear multiple layers than one thick layer of clothing,

In cold weather to preserve body heat it is important to wear multiple layers. Using the diagram explain why it is better to wear multiple layers than one thick layer of clothing,

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