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==Key Stage 3==
===Meaning===
'''Tidal''' is an [[Energy Resource|energy resource]] which uses tides to generate electricity.
===About Tidal===
: '''Tidal''' is a [[Renewable Energy Resource|renewable energy resource]].
: '''Tidal''' has [[energy]] in the [[Gravitational Potential Energy Store|gravitational potential energy store]] of water that is being pulled by the [[The Moon|moons]] [[Gravity|gravitational]] pull.
: Tides happen twice a day. Once when the [[The Moon]] is directly overhead and once when the [[The Moon]] is on the opposite side of the [[Earth]].
===Power===
{| class="wikitable"
|-
|[[File:TidalGenerator.png|center|600px]]
|}
: 1. As the tide changes water passes through the pipes in the [[tidal]] barrage.
: 2. The water causes turbines to turn.
: 3. The turbines spin a generator which makes [[electricity]].
====Advantages====
*Do not produce pollution.
*Very reliable (high tide occurs twice a day).
*No fuel costs.
*Power output can be varied by opening and closing sluice gates to control the water flow.
====Disadvantages====
*Cost to build is quite high.
*Prevent access to boats.
*Tidal height varies throughout the year.
*Damages habitats by not allowing the natural flow of the tides.
==Key Stage 4==
{{#ev:youtube|https://www.youtube.com/watch?v=7IM0fKIBGag}}
===Meaning===
'''Tidal''' is an [[Energy Resource|energy resource]] which uses tides to generate electricity.