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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.
A single NPN transistor detects the voltage drop across the shunt resistor. A silicon diode is used to bias the transistor base terminal at about 0.5v below the supply voltage. With such a bias voltage, only an additional 100mv voltage drop is needed to start turning on the transistor.