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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 rheostat is an adjustable resistor that is used to control the electrical resistance of a circuit without interrupting the flow of electrical current to that circuit. Rheostats are used for appliances and other items that need both high voltage and electrical current that can be interrupted. GSK Â· 6 years ago.