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 graph illustrates the process of producing hydroelectric

power

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in the

station

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.

According to

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the figure,

it is clear that

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there are two essential infrastructures which are a

dam

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and a

power

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station

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.

Furthermore

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, the generating method is circular, starting and ending at a high-level

reservoir

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. The most significant stage is accumulating

water

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from the river, and the

dam

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may restrict the flow direction to create a high-level

reservoir

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. In the daytime process, the

dam

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will open the gate, allowing the

water

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to flow down to the

power

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station

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and

then

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get into a low-level

reservoir

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. Because of the difference in the height level, reversible turbines are able to operate a generator to generate electricity.

Following

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this

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, the

power

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will be distributed by the national grid. At night, the

power

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station

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will change the way turbines pump

water

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from a low-level

reservoir

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to a high-level

reservoir

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,

while

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the

dam

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may be closed to prevent

water

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from flowing away. The generating process may keep repeating from daytime to night, continually producing electricity.