Definition of ballast resistor Ballast resistor

We found 2 definitions of ballast resistor from 2 different sources.

What does ballast resistor mean?

Noun
ballast resistor - a resistor inserted into a circuit to compensate for changes (as those arising from temperature fluctuations)
		ballast, barretter

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ballast resistor (Noun)
An electrical resistor whose resistance varies with the current passing through it, and thus tends to maintain a constant current.