The diagram below shows how electricity, Band 7 Answer

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.

The provided diagram depicts the process of electricity production through a hydroelectric power station.

As can be seen clearly, the process is distributed into the day and night stages. The process commences with water flowing from a river into a high-level reservoir and ends with the transmission of electricity to the general grid.

During the day, the first stage involves the storage of the water from the river into a high-level reservoir behind a dam. After that, the water passes through an intake, which is only open during the daytime and not at night. Then, the water flows to generate electricity through the turbines of the power station. After that stage, the generated electricity is transmitted to the national grid via power lines. whereas the water runs to a low-level reservoir.

During the night, the water is stored in the low-level reservoir and the turbines pump it into the high-level reservoir, which is closed during the night. The river water again is stored in the high-level reservoir and during the day it flows again down. Starting the cycle from the beginning.