Unit 1 Fossil Fuels and electricity

What is the main source of energy for power stations in South Africa?

• Wind

• Solar

• Coal

• Water

Where does the energy in coal originally come from?

• Water

• The Sun

• The Moon

• The Earth’s core

What do power stations use coal to do?

• Freeze water

• Boil water

• Make sand

• Grow plants

What happens when steam is produced in a power station?

• It melts coal

• It turns a turbine

• It cools down

• It creates pressure

What part of the power station actually produces electricity?

• Boiler
• Turbine
• Generator
• Transformer

What is a non-renewable resource?

• A non-renewable resource is a resource that is always available in abundance.
• A non-renewable resource is a resource that cannot be replaced or regenerated in a short period of time.
• A non-renewable resource is a resource that can be easily replaced.
• A non-renewable resource is a resource that regenerates quickly.

Which of these is an example of a non-renewable resource?

• Solar energy
• Hydropower
• Coal
• Wind power

What happens inside the boiler of a power station?

• Steam is condensed back into water.
• Water is heated to produce steam by burning fuel.
• Water is cooled to produce ice.
• Air is compressed to generate electricity.

Why do power stations need to store large amounts of coal?

• Because coal is heavy

• To make sure they don’t run out of fuel

• To keep the power station warm

• To protect the coal from rain

What does a transformer do to electricity before it enters our homes?

• Changes the voltage

• Stores the electricity

• Cleans the electricity

• Converts it to water