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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.
Think of a diode as a one-way street for electricity. When the diode is in forward bias, the diode allows traffic, or current, to flow from the anode, towards the cathode leg. In a reverse bias current is blocked so there is no flow of electricity through the circuit.hen the voltage across the diode is positive, a lot of current can flow once the voltage becomes large enough. When the voltage across the diode is negative, virtually no current flows. 1  N-type: With N-type doping, phosphorus or arsenic is added, in parts per billion, to the silicon in small quantities.