- Also called ballast resistor.a device, often a resistor, that maintains the current in a circuit at a constant value by varying its resistance in order to counteract changes in voltage.
- a device that maintains the current through a fluorescent or mercury lamp at the desired constant value, sometimes also providing the necessary starting voltage and current.
verb (used with object)
- ballast line,
- ballast pocket,
- ballast resistor,
Origin of ballast
Examples from the Web for ballaster
Ballaster was a commodious shooting-box in Scotland, the possession of an hospitable peer.Mr. Incoul's Misadventure|Edgar Saltus
Ballaster conferred with them pursuant to the instructions he had received, but found them obstinate and unmannerly.
Word Origin for ballast
"heavy material used to steady a ship," 1520s, from Middle English bar "bare" (see bare; in this case "mere") + last "a load, burden," or borrowed from identical terms in North Sea Germanic and Scandinavian (cf. Old Danish barlast, 14c.). "Mere" because not carried for commercial purposes. Dutch balg-last "ballast," literally "belly-load," is a folk-etymology corruption.