Ballast facts for kids
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.
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Electronic 4 lamp Ballast
Images for kids
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Cross section of a vessel with a single ballast tank at the bottom
See also
In Spanish: Lastre para niños
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Ballast Facts for Kids. Kiddle Encyclopedia.