498362
Description
Mind Map by Georgia Mealings, updated more than 1 year ago
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Created by Georgia Mealings
over 10 years ago
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Alternative Fuels
- Petrol diesel and kerosene are
fossil fuels made from crude oil.
Fossil fuels are a non-renewable
energy source that will
evententually run out.
- Biofuels are made from
plants. Plants are a renewable
resource because more can
be grown.
- Ethanol is a biofuel made from
sugar beet or sugar cane. It can
be mixed with petrol so less petrol
is needed.
- If fuel crops are grown
instead of food this could put
up food prices.
- When fuel crops grow
they take in carbon dioxide
that will be released when
they're burnt.
- Hydrogen makes a good fuel because...
- ....it releases a large amount of energy.
- ....it produces only water as a waste product
- ...it can be made from water which is cheap and plentiful.
- ....it releases a large amount of energy.
- A problem with using
hydrogen for cars is that its
flammable and explosive.
- When oxygen and hydrogen react together in
a fuel cell, the energy released is captured as
an electricity. This can be used to power a
car.
- The technology for using
hydrogen for a fuel is not
completely ready yet.
- A good fuel will...
- ...be easy to ignite and keep alight.
- ...not produce much ash, smoke or polluting gases.
- ...release a lot of energy per kg.
- ...be easy to store and transport.
- ...be cheap to produce and use.
- ...be easy to ignite and keep alight.
- Generating hydrogen by
electrolysis of water requires
electricity, which is mainly
produced by burning fossil
fuels. This means that using
a hydrogen fuelled car will
result in burning fossil fuels.
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