The diagram illustrates the production of power through the use of a hydroelectric dam.
The process begins with water in a reservoir and ends with the transmission of power via long-distance power lines.
In order to generate hydroelectricity, the first step is to collect water in a reservoir. When power generations begins the water passes through an intake in the bottom of the dam and then enters a long tunnel called a penstock. On the other hand, when power is not being produced the intake is blocked by a large gate that prevents the flow of water. However, when the intake is opened, the water flows down the penstock and the pressure it creates is used to spin a turbine, which is connected to a generator in a place referred to as the powerhouse. At the same time, the water that has gone through the turbine flows out into the river below the dam. Finally, the generator in the powerhouse is connected to power lines which are used to transport the electricity over long distances.