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 diagram explains the

process

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through which the

water

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is used to produce

electricity

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in a hydroelectric station.

Overall

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, it is evident that it is an artificial

process

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using the

water

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of the river, which is comprised of 5 stages. The

process

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commences with storing the river's

water

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in a high-level

reservoir

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and ends with providing the National grid with

electricity

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. In detail, the

process

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starts when the

water

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from the river comes to the high-level

reservoir

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and is stored in

this

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place by a high dam. In the daytime, the stored

water

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goes through a pipeline to the low-level

reservoir

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by twisting the reversible turbines.

Following

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this

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,

this

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action will operate a generator resulting in the generation of

electricity

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.

This

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electricity

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will be transmitted to the national grid by power lines.

On the other hand

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, the direction of the

water

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will be opposite at night: the

water

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pumps into the high-level

reservoir

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from the low-level

reservoir

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. The dam plays a significant role, which is closed at night and opened in the daytime. The cycle is

then

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repeated every day