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bias resistor. (electronics). A resistor used in the cathode or grid circuit of an electron tube to provide a voltage drop that serves as the bias. 1  Facebook.2  Twitter. â²bÄ«Â·És riâ²sisÂ·tÉr ]. (electronics). A resistor used in the cathode or grid circuit of an electron tube to provide a voltage drop that serves as the bias. 1  Facebook. 2  Twitter.
  The trimmer resistor is a calibration device used to correct (trim) the resistance of some other resistor.   An example might be the feedback loop of an op-amp in com â¦ mon mode. If you wanted a gain of two, you might use a resistor divider with a two to one ratio.