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Electrical Ballast
An electrical ballast (sometimes called control gear) is a device intended to limit the amount of current in an electric circuit. Ballasts vary greatly in complexity.

They can be as simple as a series resistor as commonly used with small neon lamps or light-emitting diodes (LEDs). For higher-power installations, too much energy would be wasted in a resistive ballast, so alternatives are used that depend upon the reactance of inductors, capacitors, or both. Finally, ballasts can be as complex as the computerized, remote-controlled electronic ballasts now often used with fluorescent lamps