the diagram below shows how electricity is generated in a hydroelectric power station. summarize the information and make a comparison.

The diagram illustrates the method which is mainly used to produce the electric power from a hydroelectric power station.

Overall

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, it can be seen that some procedures should be carried out in order to get electricity, and the production of it essentially relies on the presence of water and certain

turbines

Use synonyms

.

To begin

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, two reservoirs should be built in different positions, one should be on a high level,

whereas

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the other should be on a low level.

In addition

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to that,

turbines

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have two functions, during the day they act as generators that produce electricity and

this

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occurs when river water flows at a high speed

as a result

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of being stored in a high-level reservoir, it enforces the movement of

turbines

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to generate electricity, which is transmitted to the national gird.

In contrast

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, the function of

turbines

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at night is completely different because they work as pumps, which return water from the low-level tank back to the high-level reservoir for the purpose of continuing the generation of electric power and avoiding stopping the process.