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11
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Water Energy
Energy that comes from the push of water
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Moving water can push on objects
and move them
Remember that any matterthat is moving is using
mechanical energy
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So water is a source ofmechanical energy
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A long time ago,people learned to use
water energyfor waterwheels
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Waterwheels are built on streams
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A waterwheel is a large wheelwith blades on it
As water pushes on the blades,the wheel turns
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Even today, energy from waterwheels is
usedto grind grain
andto cut logs
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When water falls from a high place
to a lower place,it carries a lot of energy
Dams are built on rivers and lakes
to make use of this energy
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Dams hold back a greatamount of water
This water is sent through pipes to
water turbineshundreds of feet below.
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Water Turbine
A device that turns water energyinto mechanical energy
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A turbine is like a waterwheel,but it turns much faster
The falling water turns the turbines
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The water energy that theturbines collect
is used to run a generator
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Generator
A device that makes electricityby electromagnetic
induction
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A lot of electricity can be made by dams
Hoover Dam, on the border between Arizona and
Nevada,is one of the highest dams
in the world
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Water is a good source of energy
It does not pollute the air
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It will never run out
But water power plants can be built
only near a waterfall or a dam
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Also,dams cost a great deal of money
to build
All energy cannot come fromwater energy