If a generator's turbine is spinning the rotor, what type of energy conversion is taking place?

The correct answer is based on understanding the process occurring within a generator system. When a generator's turbine spins the rotor, it primarily utilizes kinetic energy—the energy of motion—generated by steam, water flow, or another working fluid. As the rotor turns, this kinetic energy is transformed into electrical energy through electromagnetic induction, which is the principle on which generators operate.

Inside the generator, the movement of the rotor within a magnetic field induces an electrical current in the coils of wire. This conversion is fundamental to how electrical power is generated in various types of power plants, including hydroelectric, thermal, and wind energy facilities. Hence, the transformation of kinetic energy from the turbine into electrical energy as the turbine rotates is accurately captured by the correct choice.