Class 10 Physics Sources of Energy Tidal Energy

Tidal Energy

  • The rise and fall of sea level caused by the gravitational forces exerted by the Sun, Moon and the rotation of the Earth is called a Tide.
  • A wave is not a Tide.
  • On a single day, 2 high tides and 2 low tides are usually experienced by an ocean.

 

Electricity generation using Tidal energy

 

  • Generally dams are constructed towards narrow openings of sea.
  • When there is a high tide, the increase in water in the sea is stored in the dam. The estuary has lower level of water. Water flows from sea to estuary (along the direction shown in the figure) and the turbine rotates.
  • When there is a low tide, the estuary has higher level of water. Water flows from estuary to sea (along the direction shown in the figure) and the turbine rotates.
  • As turbine rotates, electricity is generated.

Advantages of Tidal Energy

Disadvantages of Tidal Energy

·         More reliable (more than solar/wind)

·         Renewable

·         Low maintenance cost

 

·         Initial cost is very high

·         Limited power generation because tides happens only twice a day.

·         Not environment friendly because construction of dams could harm aquatic plants and animals.

 

 

Share these Notes with your friends  

< Prev Next >

You can check our 5-step learning process


.