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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 small metal or plastic shaft potentiometer or pot is a variable resistor. By connecting battery across the two ends one get variable voltage at the wiper. Hence it is called potentiometer. A carbon deposit is used as resistor in this case or wire wound potentiometers are also are available. In the second type of potentiometer wire of 1m, 4m or 10 m are used as potential divider. The wires are stretched across a wooden base.