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Energy resources can be classified into two groups.

Renewable energy resources can be replaced or regenerated and will never run out (at least not for a very long time).

Non-renewable energy resources will eventually run out – once used they cannot be used again.

Non-renewableRenewable

What do renewable and non-renewable mean?

Examples: wind and solar. Examples: coal and oil.

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How many different energy resources are part of this scene?

Spot the energy resources

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Non-renewable or renewable?

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What are fossil fuels?

Industrial societies need a lot of energy and, at the moment, rely on fossil fuels as the main source of this energy.

Fossil fuels are so useful because they contain stored chemical energy, which is converted into large amounts of useful heat energy when the fuels are burned.

they are classed as non-renewable energy resources.

Coal, oil and natural gas are fossil fuels. They are carbon-based materials that formed over millions of years from the remains of ancient plants and animals.

The total amount of fossil fuels available is limited and so

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The fuel is burned and the heat produced is used to boil water. This creates high-pressure, superheated steam, which is then used to turn a turbine.

How do fossil fuels produce electricity?

The turbine turns a generator and so generates electricity.

Power stations that are fuelled by coal and oil, operate on the same basic principle.

The cooling towers cool the steam, which condenses as water and can then be recycled in the power station.

directly to turn the turbine.

Natural-gas-fired power stations do not use steam. The natural gas is burnt and the hot gases produced are used

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What happens in a coal/oil power station?

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Energy changes in a coal/oil power station

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Stages in a coal power station – activity

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Carbon dioxide – This greenhouse gas is the main waste product of burning fossil fuels. Increased levels of carbon dioxide due to human activities are thought to be connected with global warming.

What waste do fossil fuels produce?

Burning fossil fuels creates waste products that can act as pollutants and have harmful environmental effects.

Sulfur dioxide and nitric oxides – These gaseous pollutants contribute to the formation of smog and acid rain.

What can be done to reduce the problems caused byburning fossil fuels?

Ash – This waste solid is disposed of in landfill sites.

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What is the greenhouse effect?

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Should we use nuclear power?

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Nuclear fuel is used to generate electricity but, unlike fossil fuels, it does not burn.

What is nuclear fuel?

In a nuclear power station, the heat released from nuclear fission reactions is used to change water into steam. As in other types of power station, the steam then turns a turbine, which turns a generator and produces electricity.

such as carbon dioxide or gases which cause acid rain.

In a nuclear fuel, such as uranium, reactions take place that split the atoms and release huge amounts of heat energy.

This is called nuclear fission.

Nuclear power stations do not release any greenhouse gases

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What happens in nuclear power station?

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It also contains plutonium, which is a highly-radioactive product of the fission reactions that occur in uranium nuclear fuel.

What waste does nuclear power produce?

However, plutonium is also used in the construction of nuclear bombs and poses a very serious threat if it gets into the wrong hands.

Nuclear power stations produce radioactive waste.

The used nuclear fuel contains some uranium, which can be separated from the waste and reused.

New reactors that use this waste product as a fuel have been built.

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Nuclear waste that cannot be reused poses serious problems as it can remain radioactive for thousands of years.

Where can nuclear waste be stored?

Highly radioactive waste can be turned into glass to help stabilize it and prevent leaks during storage.

Another suggested solution is to dump radioactive waste at the bottom of the sea. Dealing with nuclear waste isexpensive and any solution has to be long term.

One solution is to bury the waste deep underground. This must be in a geologically stable environment, so there are few suitable sites.

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How quickly can electricity be produced?

The demand for electricity varies depending on the time of day and time of year. Power stations have to cope with this.

Nuclear power stations take about two days to reach full power. They are only shut down for maintenance.

Power stations cannot be turned on at the flick of a switch. These are typical start-up times for power stations that use non-renewable energy resources.

1 hour

4 hours

7 hours

natural gas

oil

coal

nuclear power 48 hours

Type of fuel Start-up time

Which type of power is useful when extra power is neededfor a short time?

Natural gas power stations produce electricity quickly.

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Non-renewable energy resources will eventually run out.

Scientists think that natural gas reserves will only last another 25-30 years.

How long can non-renewable energy last?

25-30 years

about 75 years

about 300 years

natural gas

oil

coal

nuclear power thousands of years

Type of fuel Time until reserves run out

Even though nuclear fuel will last thousands of years, there is still a limited supply and so it will eventually run out.

energy resource.

It is difficult to be exact as new gas fields are still being discovered.

This is why nuclear power is classed as a non-renewable

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What are the advantages and disadvantages of burning fossil fuels in power stations to generate electricity?

Fossil fuels: what are the pros and cons?

non-renewable

acid rain

greenhouse effect

readily available

easily transported

low fuel cost

low building costs

short start-up times

inefficient

Advantages of fossil fuels

Disadvantagesof fossil fuels

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Opinions about using fossil fuels

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What are the advantages and disadvantages of using nuclear power to generate electricity?

links with cancer

Nuclear power: what are the pros and cons?

expensive to build

non-renewable

produces radioactive waste

cheaper to run once built

conserves fossil fuels

no sulfur dioxide emissions

no carbon dioxide emissions

safe under normal conditions

expensive to decommission

small amount of fuel usedso less transport needed risk of disaster

Advantages of nuclear power

Disadvantagesof nuclear power

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Opinions about using nuclear power

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Reporting about nuclear power

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Glossary (1/2)

acid rain – Rainwater that is more acidic than normal due to the release of sulfur dioxide and nitrogen oxides into the atmosphere by burning fossil fuels.

fossil fuels – Carbon-based fuels, such as coal, oil and natural gas, that are formed over millions of years from the remains of ancient plants and animals.

generator – A device used in power stations, which transforms kinetic energy into electrical energy.

global warming – The increase in the temperature of the Earth, which some scientists think is causing climate change.

greenhouse effect – The trapping of heat from the Sunby certain gases in the Earth’s atmosphere.

greenhouse gas– A gas, such as carbon dioxide, that can trap heat from the Sun in the Earth’s atmosphere.

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nuclear fission – The splitting of an atomic nucleus, which releases large amounts of energy. In nuclear power stations, this process provides the heat used in generating electricity.

nuclear fuel – Material, usually uranium, that undergoes nuclear fission and is the source of heat in nuclear power stations.

non-renewable – An energy resource that cannot be replaced or used again and so will eventually run out.

renewable – An energy source that can be replaced or regenerated and so will not run out.

turbine – A device used in power stations, which is turned by the force of moving steam. It is connected by a shaft to a generator to produce electricity.

Glossary (2/2)

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Anagrams

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Non-renewable energy resources – summary

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Multiple-choice quiz