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Fixed resistor definition A resistor having a fixed, defined electrical resistance which is not adjustable. In an ideal world a perfect resistor would have a constant ohmic resistance under all circumstances.
A variable resistor is made up of a potentiometer wired with the center leg tied to one or the other end of the pot. This permits it to act like a variable resistor. Here's a schematic to illustrate hgmjr's assertation. When wired as a potentiometer, the wiper (usually the middle connection) acts as a tap.