The diagram illustrates the process of generating electricity in a coal-powered plant.
Overall, we can see that the process includes a six stage production process, from producing heat energy to finally condensing water to the system.
First of all, coal is burned in a furnace and producing energy. Afterwards, the heat generated in the boiler converts water into steam, which is then channeled towards the turbine. Following this process, the stream drives the turbine and produce mechanical power.
Next, the turbine is connected to a generator, which transforms the mechanical energy into electricity. Then the electricity passes through a transformer to increase its voltage, is distributed transmission lines. Finally, excess steam is sent to a condenser, where it is cooled down by water from a river. And this water absorbs heat and is returned as condensed water to the system, completing the cycle.