Ballast
material that is used to provide stability to a vehicle or structure
A Ballast is a large resistor that regulates the amount of electrical current in a circuit. Most ballasts are used for fluorescent lamps to regulate the current thru it, which might rise to a dangerous level and burn it out.
Ballast is also crushed stone used in railway tracks. See ballast tamper.
Gallery
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3 Magnetic Ballasts: the ballast on the top is a Rapid start ballast, while the lower two ballasts are preheat ballasts. -
Electronic 4 lamp Ballast
