What is Ballast?
A '''Ballast''' is a large [[resistor]] that regulates the amount of electrical current in a circuit. Most ballasts are used for [[Fluorescent lamp|fluorescent lamps]] to regulate the [[Electric current|current]] thru it, which might rise to a dangerous level and burn it out. '''Ballast''' is also crushed stone used in [[railway track]]<nowiki/>s. See [[ballast tamper]]. == Gallery == <gallery> File:Magnetic Ballasts 1.jpg|3 Magnetic Ballasts: the ballast on the top is a Rapid start ballast, while the lower two ballasts are preheat ballasts. File:Fulham Workhorse 4 ballast.jpg|Electronic 4 lamp Ballast </gallery> [[Category:Electronic components]]