Page 162 - Science Coursebook

11.1 How we use energy

Energy is important to us. Whatever we do, we need a supply of
energy.
Our bodies use the energy that we get from our food. This
enables us to move around, to think, to stay warm and so on.

Questions
1 You learnt about food and digestion in Stage 8
Unit 2. What two types of nutrient are our main
sources of energy?
2 What is the original source of the energy we get
from our food?

More and more energy Maize, an important food crop,
It is useful if we can find other ways of using energy. supplies energy to millions of

people around the world.
For example, many people work on farms. Farmers
can also make use of animals to do some of the heavy
work, such as pulling loads.

Machines can also do work for us. Like people and
animals, machines need a supply of energy. Some work
using electricity. Others use fuels, such as coal or oil.

Over many centuries, people have discovered how to

make use of many different sources of energy.

What we use energy for
The pie chart shows the three main types of
energy we use. Cars are machines. They usually use diesel or

In our homes, schools, factories and offices, we use petrol (gasoline) as their energy supply.
energy for heating and cooling, for cooking, for lighting
and so on. homes and
offi ces
We need energy to travel around, so we use energy
for transport.
Industry uses energy for making things. Everyone uses
things that are manufactured.
transport

Question industry

3 Look at the pie chart. Which sector uses the
most energy? The three main sectors where energy is
used. These data are for the whole world.

160 11 Energy

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