Final answer:
The device that converts mechanical energy into electrical energy is known as a generator, which is typically connected to a turbine in power plants.
Step-by-step explanation:
The sequence related to energy conversion involves several steps: fuel is combusted to create kinetic energy, which is then converted into mechanical energy. This mechanical energy can be converted into electrical energy through the use of certain machinery. The conversion from kinetic energy to mechanical energy is completed by an engine, and the machine part that turns mechanical energy into electrical energy is typically a generator. Therefore, the correct answer to which machine part turns mechanical energy into electrical energy is C) Generator.
Generators work by harnessing the mechanical energy produced by engines, such as in nuclear power plants, and using that to generate electrical energy in the generators of power plants. The process usually involves thermal energy being used to produce steam, which then drives a turbine connected to the generator, translating mechanical motion into electrical current.