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Answer :

Hydro-power plant is the place where electricity is generated through use of water falling. The potential energy of water generates electricity by falling the water on turbine the turbine rotates which rotates the shaft of generator then generator converts mechanical energy into electrical energy. No fuel is required in hydropower plant so the cost of fuel is free. Also, the hydropower plant is pollution free. 

For advantages of hydro-power see this  

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Answer :

The potential energy of water is coverted into kinetic energy by flowing it from height and with the help of k.e. Turbines are rotate at particular speed it means the k.e. Of water is again converted into mechanical energy.due to motion of turbine the dynamo generates the high voltage it means it finaly converted into electrical energy.

Then we simply define the hydro power plant as it give the conversion of P.E OF water into electrical energy
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