Potential energy of the water in the reservoir changes to kinetic energy as it is forced through the turbine. The blades of turbine represent mechanical energy, spinning the turbine generator which converts the mechanical energy into electrical energy due to the nature of the generator.
Generators use electromagnetic induction turbines, which at its basic level is rotating a wire within a magnetic field, this generating electricity.
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The potential energy in the head of water is converted into kinetic energy in the turbine which converts the kinetic energy into electrical energy.
Potential Energy of water -> Kinetic Energy -> Electrical Energy
Typically, chemical energy is transformed to heat, heat to mechanical, and mechanical to electrical.
HYdroelectric power is pretty cool and here is a diagram:
draft tube
The turbines or Pelton wheels in a hydroelectric power plant are turned by water pressure.
The same thing as in a fossil fueled or hydroelectric power plant.
This is called hydroelectric power, or hydro power.