What function does the steam turbine serve in a power plant?

The steam turbine plays a crucial role in a power plant by converting steam energy into mechanical energy. In the process, steam generated from boiling water under high pressure flows into the turbine, where it expands and does work on the turbine blades. This interaction causes the blades to spin, which converts the thermal energy contained in the steam into rotational mechanical energy.

This mechanical energy is then typically utilized to drive a generator, which transforms the mechanical energy into electrical energy, making it a central component in the generation of electricity within the power plant. The efficiency and effectiveness of this conversion process are vital for the overall energy production capabilities of the facility.

The other functions mentioned in alternative choices do not accurately describe the purpose of a steam turbine. For instance, converting mechanical energy into thermal energy or controlling water levels in a boiler pertains to different systems and operations within a power plant and do not relate to the primary function of the steam turbine.