You should spend about 20 minutes on this task. The diagrams below show the design for a wave-energy machine and its location. Summarize the information by selecting and reporting the main features and make comparisons where relevant. You should write at least 150 words.

The diagram illustrates data about the process of producing electricity in hydroelectric

power

stations.

Overall

, the process is cyclical, and it starts when a river flows to a high-level

reservoir

. The

water

of the river is stored behind a dam, which has an intake. The entrance is open during the day and it is closed at night. In the daytime, the stored

water

in the high-level

reservoir

passes the intake and goes down to the

power

station, where the reversible

turbines

are, and it moves them. Having moved by the

water

,

then

the

turbines

operate the generator, and

that is

when the electricity is produced.

Subsequently

, the generated

power

goes into

power

lines and the national grid. The

water

that was used to move the

turbines

flows to a low-level

reservoir

, and it is held there until night. At night time, the

water

that was kept in the lower

reservoir

goes back to the station, where the

turbines

are. After that,

turbines

pump it towards the higher

reservoir

. Having been pumped to the high-level

reservoir

,

then

the

water

is restored in that

,

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and is ready to be reused.