We can use energy from wind to drive turbines directly
In a wind turbine, the wind is passing over blades makes them rotate and drives the generator at the top of the narrow tower
Electrical energy can be obtained from the falling water, waves or tides.
Hydroelectric power collects water in a reservoir. This water is allowed to flow downhill and turn turbines at the bottom of the hill.
In pumped storage system, surplus electricity is sued to pump water back up to the hill to the top of the reservoir. This means the energy is stored and can be release when demand for energy is high.
- Advantage: Renewable, reliable in wet areas, free, non-pollutant
- Disadvantage: Only works in wet hilly areas, areas have to be flooded for damming
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