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Francis turbines are often used[br]for medium sized power plants.

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For the production of electricity,

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a shaft connects the electric generator[br]to a moving wheel.

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The moving wheel is provided[br]with fixed blades.

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The guiding wheel surrounds[br]the moving wheel.

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The blades on the moving wheel[br]are steerable.

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

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The water supply for the[br]Francis turbine

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is generally enabled by a spiral cover[br]surrounding the impeller.

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

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The turbined water then escapes[br]through the tailrace.

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The rotation of the turbine[br]drives the rotor of the electric generator

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which produces electricity.

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