The diagram below shows how electricity is generated in a hydroelectric power station. Summarise the information by selecting and reporting the main features, and make comparisons where relevant.

The figure describes how the kinetic energy of stored

water

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in a dam is used to run a

turbine

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to produce electric power in a hydroelectric powerhouse. The

water

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obtained from downstream of a river is stored in a high-altitude

reservoir

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of a dam. The

water

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from the intake of the

reservoir

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, which is opened during the daytime, is made to flow through the blades of the

turbine

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. The

turbine

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, which is coupled to an electric generator, is rotated by the impact of

high

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the high

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kinetic energy of the fluid. The power generated by the rotation of the armature of the generator is transmitted to the national grid. The

water

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at the discharge of the

turbine

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is stored in a low-altitude

reservoir

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. At night,

he

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the

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surplus amount of electrical energy from the grid station is supplied to the generator, which in

this

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case operates as a motor, and runs the reversible

turbine

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, which at night, acts as a pump, to deliver the

water

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from

lower

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the lower

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to

higher

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the higher

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reservoir

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.

Hence

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, the level of

water

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in high-level storage is maintained and can be used to run the

turbine

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the

next

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day.