The world's energy needs

The world's energy needs

S3 Physics

Energy sources

• The world's energy needs includes electricity, fuel, water

• Energy sources can be categorised into two: primary sources and secondary sources

• Some energy sources cannot be renewed and will run out one day, these are non-renewable energy sources

• Some energy sources are abundant and can be replaced quickly after they are converted into the form of energy that we need. These are renewable energy sources

Multiple Select

Let's guess: Which ones are primary energy sources?

• coal

• oil

• electricity

• hydrogen gas

• sunlight

Primary sources are sources that are readily available / can be used directly

• Coal

• Oil

• Uranium

• Wind

• Water

• Biomass

Secondary sources are sources that are produced by the primary sources

• Electricity

• Fuels; petrol/gasoline

• Hydrogen gas

Primary energy converters

To produce secondary sources rom primary sources, we need to have primary energy converters.

For example

Power stations - convert coal into electricity

Refineries - produce petrol/gasoline

Solar cells - convert sunlight into electricity

Hyrogen gas production

Open Ended

Checkpoint 1: The difference between primary and secondary sources is ...

Multiple Select

Which ones do you think are non-renewable energy sources?

• Coal

• Wind

• Wood

• Gas

• Solar

Non-renewable energy sources

• Coal

• Oil

• Gas

• Uranium

Renewable energy sources

• Wood

• Solar

• Geothermal

• Wind

• Water

Open Ended

Checkpoint 2: Which energy source was used the most in 1900?

Open Ended

Checkpoint 3 : Which energy source was used the most in 2000?

Fossil Fuels

How were fossil fuels formed?

how does a fossil-fuel power station works?