The rotating fields of an alternator make up what?

• A. The stator
• B. The rotor
• C. The magnetic circuit
• D. The armature

Answer: (B)

Rotating magnetic field is produced by the rotor. The rotor carries the field windings (or magnets) and, when excited, creates a magnetic field that rotates as the rotor turns. As this rotating field sweeps past the stationary windings in the stator, it induces an AC voltage in them. The stator is the stationary part where the output is generated, the magnetic circuit guides the flux, and the armature refers to the windings where current is drawn (typically the stator windings in an alternator). So the rotating fields of an alternator are produced by the rotor.