Gas/Steam turbine for power generation
By definition, the rotor is the part of the generator that turns, while the stator is fixed. So the turbine, which is turned by the steam/gas pressure, must be connected to the rotor. In a synchronous generator, the rotor has a fixed magnetic field. As the rotor is turned by the turbine, the field passing through the coils fixed to the stator changes and a changing voltage is induced in them. This voltage can be used to extract power from the generator.