the diagram below shows how electricity is generated in a hydroelectric power station. summarize the information and make a comparison. Write at least 150 words.

The diagram illustrates the method which is mainly used to produce the electric power from a hydroelectric power station.

Overall

, it can be seen that some procedures should be carried out in order to get electricity, and the production of it essentially relies on the presence of water and certain

turbines

.

To begin

, two reservoirs should be built in different positions, one should be on a high level,

whereas

the other should be on a low level.

In addition

to that,

turbines

have two functions, during the day they act as generators that produce electricity and

this

occurs when river water flows at a high speed

as a result

of being stored in a high-level reservoir, it enforces the movement of

turbines

to generate electricity, which is transmitted to the national gird.

In contrast

, the function of

turbines

at night is completely different because they work as pumps, which return water from the low-level tank back to the high-level reservoir for the purpose of continuing the generation of electric power and avoiding stopping the process.