The diagram below shows how electricity is generated in a hydroelectric power station

The given picture illustrates the way how a hydroelectric

power

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station

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is

functioned

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functions

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to produce

electricity

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.

Overall

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, the whole hydroelectric

power

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station

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contains low-level and high-level reservoirs, a

power

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station

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and

power

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lines. There are two different operating approaches between day and night.

To begin

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with,

this

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power

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station

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takes the advantage of the river to generate

electricity

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using the height difference in

water

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level.

Firstly

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, during the day time, the dam of the high-level

reservoir

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is opened to let the

water

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flow through the hill down to the

power

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station

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to produce

electricity

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.

Then

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, the reversible turbines function to operate a generator in the

power

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station

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. The generated

electricity

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is conveyed through

power

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lines to the national grid and the

water

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flows past the dam into the low-level

reservoir

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.

Secondly

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, at night, the reversible turbines pump the

water

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from the low-level

reservoir

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across the

power

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station

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to the high-level

reservoir

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where the dam is closed so that the

water

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in there is kept.