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==Key Stage 3==
===Meaning===
'''Hydroelectricity''' is an [[Energy Resource|energy resource]] that uses the water flowing in rivers to generate electricity.
===About Hydroelectricity===
: '''Hydroelectricity''' is a [[Renewable Energy Resource|renewable energy resource]].
: '''Hydroelectricity''' has [[energy]] in the [[Gravitational Potential Energy Store|gravitational potential energy store]] of water that is flowing downhill.
===Power===
'''Hydroelectricity''' can be used to generate [[electricity]].
{| class="wikitable"
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|[[File:HydroelectricDamDiagram.png|center|600px]]
|-
| style="height:20px; width:200px; text-align:center;" |A [[diagram]] of a [[hydroelectric]] dam.
|}
: 1. Water flowing down a river is held back by a dam making a large reservoir.
: 2. Some water is allowed through pipes to flow downhill.
: 3. This water turns a turbine as it falls.
: 4. The turbine causes a generator to spin.
: 5. The generator makes an electrical current.
====Advantages====
*Reliable source as it is built in places that do not suffer drought.
*Power provided can change at a moments notice by allowing more water through the turbines.
*Low running costs and no fuel cost.
====Disadvantages====
*Expensive to build.
*Require the flooding of a large area of land.
*Destroys habitat of some creatures.
*Blocks the migration of some river species.
*Can only be built in certain locations.
==Key Stage 4==
{{#ev:youtube|https://www.youtube.com/watch?v=Qef-f2KobIY}}
===Meaning===
'''Hydroelectricity''' is an [[Energy Resource|energy resource]] that uses the water flowing in rivers to generate electricity.