What is one advantage of using a rotating field alternator over a rotating armature alternator?

The advantage of using a rotating field alternator over a rotating armature alternator primarily lies in its greater current capacity. This is due to the design of rotating field alternators, where the magnetic field is generated by electromagnets that rotate within the stator. Because the field windings are on the rotor, it allows for a smaller and lighter construction, enabling higher currents to be produced without the limitations associated with the larger rotating armature found in traditional alternator designs.

In contrast, rotating armature alternators tend to have bulkier armature windings, which can complicate cooling and reduce the maximum current capacity due to physical size and winding weight constraints. The rotating field design also allows for easier maintenance and replacement, enhancing overall functionality.

While the other options might suggest advantages, they do not accurately represent the key benefits of rotating field alternators specifically in terms of their capacity to handle higher currents effectively.