Energy is the ability to do work and there are many types of energy.
Mechanical Energy
is the energy of motion that does the work like the wind turns a windmill.
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Heat Energy
where motion or rise in temperature is caused by heat like a fire in your fireplace.
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Chemical Energy
is the chemical reaction causing changes; food and fuel both store chemical energy.
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Electrical Energy
is when motion, light or heat is produced by an electrical current like the electric coils on your stove.
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Gravitational Energy
where motion, like water going over a dam, is caused by gravity's pull.
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When energy is used it's changed from one form to another. Let's look at an example of how energy changes: The gravitational energy of falling water changes to mechanical energy when it turns a turbine. The energy from the turbine turns a generator that creates electricity that you use to turn on a light.
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