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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.
Resistor sources are considered to be the simplest forms of current source. They involve a circuit that contains a resistor in series with a source of voltage. The current generated from this system is equivalent to the amplitude of the voltage, divided by the resistance of the resistor. A resistor current source is generally not considered effective on its own because of the large amount of power lost in the resister, but many types of current source use elements of this setup. For example, active current sources often substitute a different element for the resistor.