The sentence in the paragraph that BEST supports the central idea that electricity can be formed by capturing the power created by moving parts is: "Using a process called fission, nuclear power plants produce steam in order to spin turbine parts and make electricity."
The mentioned sentence explains the process by which electricity can be generated by capturing the power created by moving parts in the context of nuclear power plants.
Process of Fission: The sentence begins by introducing the process called fission. Fission is a nuclear reaction in which the nucleus of an atom splits into smaller parts, releasing a significant amount of energy.
Steam Production: The sentence then explains that as a result of fission, nuclear power plants produce steam. This indicates the conversion of the released nuclear energy into thermal energy.