The diagram below shows how electricity is generated in a hydroelectric power station.
Summarize the information by selecting and reporting the main features, and make comparisons where relevant.
Write at least 150 words
The given diagram describes the process of electricity production
in a dam with reversible turbines.
Overall, such an electricity generation facility requires a dam with two reservoirs, upper and lower, a tunnel to channelize water, a reversible turbine, and a generator. This installation generates electricity during the day.
During the day, water from the high-level reservoir behind the dam, which is sent to the low-level reservoir with the help of the tunnel by opening the intake. The water, while flowing towards the lower reservoir passes through the power station, driving reversible turbines in the process. The turbines in turn drive the generator which produces electricity. The electricity generated is supplied to the national grid with help of power cables.
During the night, the intake is closed in the high-level reservoir, and water is pumped back to the this reservoir from the low-level using reversible turbines, which start working backwards, and with the help of the water tunnel, pump back the water to the high-level reservoir.
