- 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.
Idioms about ballast
Origin of ballast
OTHER WORDS FROM ballast
How to use ballast in a sentence
She ballasted the boat, and for Bompard she was something to lean against.The Beach of Dreams|H. De Vere Stacpoole
She had been literally ballasted with silver, and carried also several precious boxes of gold and jewels.The Ontario Readers: Fourth Book|Various
His corpulency would always be hinting to you that he was too trimly built, too well ballasted, to be in danger.The Silver Poppy|Arthur Stringer
By being properly ballasted, a boat can pass either through or over a sea without being driven astern.
As the boat must be well ballasted, she must have limited breadth of beam, as also limited side buoyancy.