Question

short notes on hydroelectricity

Answer 1

hi,
here ur answer,
Hydroelectricity is electricity produced by movement of water. It is usually made with dams that block a river to make a reservoir or collect water that is pumped there. When the water is released, the pressure behind the dam forces the water down pipes that lead to a turbine. This causes the turbine to turn, which turns a generator which makes electricity.

This renewable energy method makes about one sixth of the world's electricity. It produces less pollution than the fires of steam enginesdo. Some places such as Norway and Quebecget most of their electricity this way.


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Answer 2

Hydroelectricity is electricity generated by hydropower, i.e., the production of power through use of the gravitational force of falling or flowing water. 

It is the most widely used form of renewable energy. Once a hydroelectric complex is constructed, the project produces no direct waste, and has a considerably lower output level of the greenhouse gas carbon dioxide (CO2) than fossil fuel powered energy plants. 

Worldwide, hydroelectricity supplied an estimated 715,000 MWe in 2005. This was approximately 19% of the world's electricity (up from 16% in 2003), and accounted for over 63% of electricity from renewable sources. 

Disadvantages of hydroelectric power include the fact that such projects can be disruptive to surrounding aquatic ecosystems, both upstream and downstream of the plant site. In rare, but disastrous, circumstances, dams can break and cause widespread flooding and considerable loss of life.