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 given diagram depicts the process, which is about how a hydroelectric

power

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station produces electricity.

Overall

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, there are distinctive stages of

this

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process during the

day

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and

night

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. It starts with the

water

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from the river, which is in a high-level

reservoir

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. The

water

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will eventually find its way and go to the

power

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station to light up the national grid.

First,

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the

water

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from the river is reserved in a high-level

reservoir

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.

Second,

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we can see a dam which is opened during the

day

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and closed at

night

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. Throughout the

day

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, after being flown, electricity is generated by

water

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,

while

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at

night

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,

water

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is flown through pumping.

Third,

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the generator is operated by reversible turbines in the

power

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station.

Finally

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, the

power

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produced by the generator will

power

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the national grid through

power

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lines. Throughout the

night

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, after being pumped by reversible turbines, the

water

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goes into a high-level

reservoir

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,

while

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during the

day

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it goes into a low-level

reservoir

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.