The diagram illustrates the operating principle of a hydroelectric power station which can generate electricity.
The hydroelectric power station which has a dam on the upstream is established along a river. At day time, the intake of dam is open so that the flow of water from high-level reservoir can generate electricity by flowing into the power station. There are reversible turbines which can operate generator in the power station where the electricity can be transported into national grid through power lines.
At night, the water in low-level reservior which is used will flow back to the reversible turbines. By contrast, they can pump water into high-level reservoir. Additionally, the flow of water during pumping will be reserved in high-level reservoir again for generating electricity tomorrow.
In conclusion, the diagram is clear and accessible for beginners to gain some knowledge of electricity generation in hydroelectric power station which is a rather environmental friendly electricity factory.
