Final answer:
Nuclear power plants use fission reactions to generate heat and produce steam which turns a turbine to generate electricity.
Step-by-step explanation:
Nuclear power plants use fission reactions to generate heat to produce steam to generate electricity. In a nuclear power plant, the heat produced by the fission reactions of uranium or plutonium is used to boil water and produce steam. This steam is then used to turn a turbine, which powers a generator to produce electricity