What is the primary function of a ballast in electrical systems?

The primary function of a ballast in electrical systems, particularly in relation to fluorescent and high-intensity discharge (HID) lamps, is to aid in starting the lamp and to limit the current flow once the lamp is operating. When a fluorescent lamp is turned on, the ballast provides the necessary voltage to ignite the gas within the lamp. After ignition, it regulates the current to ensure that the lamp operates efficiently without drawing excessive power, which could lead to failure or damage.

This role is crucial because without a proper ballast, the lamp would not function correctly and could result in flickering or even damage due to overpowering. Therefore, the ballast is integral to the safe and efficient operation of various types of lamps in electrical systems.