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

process

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of producing

electricity

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from

water

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behind a

dam

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is depicted in the diagram.

Overall

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, in

this

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process

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potential

energy

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of

water

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transforms into kinetic

energy

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and turns into

electricity

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. As is shown in the diagram, the

process

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is quite simple, on the one hand, a high-level

dam

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stores

water

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,

then

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in the

electricity

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peak consumption periods, during day time,

water

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travels from

this

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dam

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to a low-level reservoir and

due to

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losing altitude the

water

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's potential

energy

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transforms into kinetic

energy

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, and

water

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with a great amount of kinetic

energy

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hits the blades of the turbine and makes it rotate and because of

this

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rotation the generator delivers

electricity

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to National grid.

On the other hand

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, the amount of

water

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is not unlimited, to solve

this

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problem when the

electricity

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peak consumption periods, generally during night time, is passed, the

process

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reverses and the turbine acts as a pump and uses the grid

electricity

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to send low potential

water

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to

high-level

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the high-level

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dam

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to reuse the

water

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in peak time.