resistor : Idioms & Phrases
ballast resistor
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noun a resistor inserted into a circuit to compensate for changes (as those arising from temperature fluctuations)
barretter; ballast.
WordNet
thermal resistor
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noun a semiconductor device made of materials whose resistance varies as a function of temperature; can be used to compensate for temperature variation in other components of a circuit
thermistor.
WordNet
variable resistor
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noun resistor for regulating current
rheostat.