Definitions for ballast resistor
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Princeton's WordNet
ballast resistor, ballast, barretter(noun)
a resistor inserted into a circuit to compensate for changes (as those arising from temperature fluctuations)
Wiktionary
ballast resistor(Noun)
An electrical resistor whose resistance varies with the current passing through it, and thus tends to maintain a constant current
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"ballast resistor." Definitions.net. STANDS4 LLC, 2013. Web. 20 Jun 2013. <http://www.definitions.net/definition/ballast resistor>.

