- 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)
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Idioms for ballast
Origin of ballast
OTHER WORDS FROM ballast
Example sentences from the Web for ballast
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