Tidal, Wave and Hydroelectric Energy Resources - GCSE Physics

This is a video introducing more renewable energy sources; tidal energy, wave energy and hydroelectric energy. These are all ways to capture the energy stored in water that is either moving or higher than its surroundings.

Tidal barrages allow the sea to flow through them as the tide comes in. Then when the tide goes out, the tidal barrage stops the tide so that the gravitational potential energy that the water has gained can be harnessed. The water stored at a height then flows through the barrage, turning a turbine which turns a generator which produces electricity. This is tidal energy.

Dams allow us to store water at a height above sea level. The water is a vast source of gravitational potential energy which is then transferred to kinetic energy in order to turn a turbine which turns a generator that produces electricity. Surplus energy within the National Grid can be used to pump water back up to the reservoir. This is hydroelectric energy.

Specially constructed turbines can harness the waves. Trapped air between the surface of the sea and the turbine flows through the turbine as the waves make the surface of the sea rise and fall. Alternatively, floating booms with cleverly engineered hinges can produce electricity as waves cause the boom to rotate about its hinges. This is wave energy.

These energy sources are renewable, however they can pose a danger to wildlife as they can cause flooding.

Thanks for watching,

Lewis

Relevant for GCSE Physics 9-1 in the following exam boards:
AQA (including Trilogy)
Edexcel
CCEA
OCR A
OCR B
WJEC
CIE (Cambridge International Examinations) IGCSE
Edexcel International IGCSE (Physics only)

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