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.

This

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diagram illustrates the different stages of generating electricity by a hydroelectric power station. Looking from an

overall

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perspective, it is readily apparent that the station works in a cyclical pattern on days and nights.

While

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with the help of

water

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flow it produces electricity during days, it pumps back the

water

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at night. The process begins with the dam, which has a lot of

water

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in its high-level

reservoir

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. By opening the dam, the

water

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flows into a generator and drives the station's

turbines

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. By the rotation of the

turbines

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, the generator works and produces electricity, which goes directly to the national grid with the help of power lines that are incorporated into the generator.

Additionally

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, the

water

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flow that passes through the

turbines

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will go into a low-level

reservoir

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. When the whole process is finished, at night, the

turbines

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are rotated in reverse to extract the

water

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from the low-level

reservoir

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and pump it to the dam. The whole

water

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flows in the high-level

reservoir

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to save for the days.