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

This

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diagram illustrates the stages of production of

electricity

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in a hydroelectric power station.

It is clear that

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the process is cyclical and consists of 4 main stages beginning with the deposit of

water

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behind the dam , the flow of

water

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to generate

electricity

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during the day

then

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storage

water

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in

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the down

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down stage

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downstage

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and

finally

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the pumping of

water

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at night to

upper

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the upper

an upper

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level. First of all the

water

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of the river saves behind of dam in the upper reservoir which has an intake at the bottom. during the day, intake is opened and

then

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water

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flows down

in

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into

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the low-level reservoir. In the middle of the process , there is a turbine belonging to the generator. when the blades of that begin to move the generator creates

electricity

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and

finally

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the products transmit through power lines to the national grid.

In addition

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, the

water

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of the down reservoir returns

through

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in

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the same way in the high-level storage at night by pumping

water

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with the turbine

due to

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decline demand

of

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for

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electricity

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.