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Francis turbines are often used for medium sized power plants.
For the production of electricity,
a shaft connects the electric generator to a moving wheel.
The moving wheel is provided with fixed blades.
The guiding wheel surrounds the moving wheel.
The blades on the moving wheel are steerable.
A simple rotation allows the power of the turbine to be adjusted.
The water supply for the Francis turbine
is generally enabled by a spiral cover surrounding the impeller.
The water engulfs the penstock, and moves toward the spiral sheet.
The turbined water then escapes through the tailrace.
The rotation of the turbine drives the rotor of the electric generator
which produces electricity.
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