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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 biasing voltage is derived from the voltage drop across the load resistor, RL. So if the load current increases there will be a larger voltage drop across RL, and a corresponding reduced collector voltage, VC which will cause a corresponding drop in the base current, IB which in turn, brings IC back to normal.ase Biasing a Common Emitter Amplifier. One of the most frequently used biasing circuits for a transistor circuit is with the self-bias of the emitter-bias circuit where one or more biasing resistors are used to set up the initial DC values of transistor currents, (IB), (IC) and (IE).