Energy from Water (CIE IGCSE Physics)
Revision Note
Author
LeanderExpertise
Physics
Wave & Tide Power
- The rise and fall of waves or the tide can be used to turn a turbine and generate electricity
Underwater turbines generate electricity
Tidal Barrage
Advantages
-
- No pollution
- Reliable and can produce a large amount of electricity at short notice
- Renewable energy resource
- Small systems are being developed to provide electricity for small islands
Disadvantages
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- Expensive to build
- Damages fragile habitats
- Very few suitable locations
- The technology is not advanced enough for large scale electricity production
Hydroelectric Dams
- When water is stored above ground level it has energy in its gravitational potential store
- This energy can be transferred to kinetic energy if the water is allowed to flow down the slope
- Flowing water turns the turbine to generate electricity
A hydroelectric dam transfers energy from the gravitational potential energy store of the water to its kinetic energy store mechanically to generate electricity
Advantages
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- Can respond to demand so is reliable and available
- Can generate large scale amounts of electricity
Disadvantages
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- Need to flood valleys to build which destroys habitats, towns and villages
- The pumping systems can release large amounts of greenhouse gases
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