Question

Where does the alternator rotor get its excitement voltage?

Option 1: From a mechanical key
Option 2: From a fuel injection system
Option 3: From a battery
Option 4: From the stator

Answer 1

The alternator rotor gets its excitement voltage from the stator. In electric generators, a coil is rotated in a magnetic field to produce an alternating current emf, induced by the changing magnetic field created by the stator.

Step-by-step explanation:

The alternator rotor gets its excitement voltage from the stator.

In electric generators, a coil is rotated in a magnetic field to produce an alternating current emf. This emf is induced in the coil by the changing magnetic field created by the stator, which consists of magnets and coils of wire. The rotation of the rotor causes the magnetic field lines to cut across the coils of wire in the stator, inducing a voltage in the coils.