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♪ [Music] ♪

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Francis turbines are often used
for medium sized power plants.

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For the production of electricity,

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a shaft connects the electric generator
to a moving wheel.

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The moving wheel is provided
with fixed blades.

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The guiding wheel surrounds
the moving wheel.

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The blades on the moving wheel
are steerable.

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A simple rotation allows the power
of the turbine to be adjusted.

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The water supply for the
Francis turbine

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is generally enabled by a spiral cover
surrounding the impeller.

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The water engulfs the penstock,
and moves toward the spiral sheet.

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The turbined water then escapes
through the tailrace.

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The rotation of the turbine
drives the rotor of the electric generator

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which produces electricity.

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♪ [Music] ♪