- 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 ballasting
One reason for deferring the masonry work as well as the ballasting was the inability to handle the necessary supplies.The Story of the First Trans-Continental Railroad|W. F. Bailey.
A large number of men were shoveling the gravel onto flat cars, to be hauled on the line of the railroad for ballasting the track.The White Rose of Memphis|William C. Falkner
In the permanent way and ballasting, the reduction will be about one-half.The life of Isambard Kingdom Brunel, Civil Engineer|Isambard Brunel
This is called a "ballasting resistance" and is usually an iron wire in a glass bulb containing hydrogen.Artificial Light|M. Luckiesh
I mean all he wants is ballasting with a little of that business spirit which we call American push.The Silver Poppy|Arthur Stringer
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.