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Wave Energy ­ energy from sea waves
The sea's waves have kinetic energy. Using machines that bob up and
down in the waves, this energy can be turned into electrical energy
which we can use in our homes.
wave energy
machines bobbing
up and down in the
waves
­ Need lots of machines to get a
reasonable amount of energy
+ Renewable ­ The machines costs a lot of
+ No pollution, because money
nothing gets burned ­ The machines can look ugly
­ The machines can be damaged
by storms…read more

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Hydroelectric Energy ­ energy from rivers
The water flowing in a river has kinetic energy. We can turn this into
electrical energy to use in our homes. We usually need to build a
dam, and let the water flow through it gradually.
+ Renewable ­ Costs a lot of money to
+ No pollution, because nothing build a dam
gets burned ­ The dam can ruin the local
+ We can store the water up environment, because it
high, and then whenever we changes where the water
need the energy we can let the naturally flows. Some
water out animals and plants may die.…read more

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Tidal Energy ­ energy from sea tides
If you've ever been to the coast, you may have noticed that the sea
level goes up and down, because of tides. When the tide is high, the
water has lots of gravitational potential energy, which we can turn
into electrical energy to use in our homes.
1. At high tide, we trap the water behind a
dam.
2. At low tide, the water is released, and its
energy is used to generate electricity.
+ Renewable
+ No pollution, because nothing
gets burned
+ Reliable, because there are
always two tides every day
+ Cheap to run, once it's built
+ Costs a lot to build the dam
+ The dam may cause local flooding…read more

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Solar Energy ­ energy from the Sun
The Earth gets heat and light energy from the sun all the time. Can
we use it ­ yes we can! The Sun's energy can either be:
1. changed into electrical energy to use in homes, using solar cells;
2. or used to heat water for homes, using solar panels.
+ Renewable
+ No pollution, because
nothing gets burned
+ Solar cells and solar
panels are expensive
+ Only works if it's sunny!…read more

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Wind Energy ­ energy from the wind
Using wind turbines, we can turn the kinetic energy of the wind into
electrical energy which we can use in our homes. This is `wind
energy'.
+ Renewable
+ No pollution, because nothing
gets burned
+ Turbines are quite cheap and
easy to build, so they can be
used even in poor countries
+ Turbines can be ugly and noisy
+ Only works if it's quite windy!
If the wind stops, you get no
energy.…read more

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