- 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)
Origin of ballast
Examples from the Web for ballasted
That man died a hundred times in the ten minutes wherein we ballasted him.Tomaso's Fortune and Other Stories|Henry Seton Merriman
He was very sure that any boat would behave badly if rigged and ballasted as the Goldwing was.All Adrift|Oliver Optic
On this occasion she carried, besides, a little parachute, ballasted by a firework terminating in a ball with silver rain.A Voyage in a Balloon (1852)|Jules Verne
They usually resulted in his being hand-cuffed and ballasted by a ball and chain, or confined in a filthy cell.The Secret Service.|Albert D. Richardson
If not ballasted, the vessel would not be sufficiently immersed, and would change its position every moment.The Kingdom of God is Within You, What is Art|Lyof N. Tolstoi
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.