The Voltage Regulator controls current to which component?

• A. Main exciter
• B. Battery
• C. Generator
• D. Starter motor

Answer: (A)

The regulator maintains the generator’s output by controlling the excitation current to the main exciter field winding. It senses the system voltage and adjusts how much current flows into the main exciter. More excitation strengthens the magnetic field and raises the generator’s voltage; less excitation weakens the field and lowers the voltage. By modulating the main exciter current, the regulator sets the generator’s output level. The battery is charged from this regulated voltage, but the regulator’s direct action is on the main exciter; the starter motor isn’t involved in voltage regulation.