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The given diagram explains the generation of electricity in a hydroelectric

power

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station. Overall, it can be said that the whole

process

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is depended on the high-level

reservoir

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and the low-level

reservoir

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, the

water

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flows from the former

reservoir

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to the latter

reservoir

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during day time and

conversely

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at night. As shown in the

process

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, during the daytime, when the dam is opened the river

water

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stored in the high-level

reservoir

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flows to the low-level

reservoir

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through the reversible turbines located in the

power

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station. The

water

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flow rotates the turbines and which makes the generator operate, and

then

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the generator provides

power

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to the national grid through the

power

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lines.

On the other hand

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, during the night reverse

process

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take place the

water

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is pumped from the low-level

reservoir

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through the same reversible turbines to the high-level

reservoir

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and once the

water

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has reached there the dam is closed to preserve the

water

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for the

next

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day

process

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.