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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 a resistor with variable resistance.There are many type of rheostat,involved of a rotary-type rheostat and a sliding rheostst.I dunn know much about the rotary-t â¦ ype rheostat but I can tell u how does a sliding rheostat work. The purpose of the rheostat is use to change the resistance of the circuit. The rheostat is use to define Ohm Laws th â¦ e 2nd situation is use to find out what the fixed resistor's resistance. 3rd purpose: used to control the resistance of circuit. eg Radio.