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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.
Bias voltage is the amount of voltage that an electronic device needs in order to power on and function. Without bias voltage, an electronic device wouldn't have the power to turn on and be operated. A microphone is one such device which needs bias voltage in order to operate. If a microphone doesn't receive this power, it can't record any signals and thus it's inoperable.