What is variable resistance ?
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Resistance is a property of conductor due to which it resists the flow of electric current through it. Variable Resistance: The component of an electric circuit which is used to regulate the current; without changing the voltage from the source; is called variable resistance.
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Potentiometer
A potentiometer is a three-resistor with a sliding or rotating contact that form an adjustable voltage divider .if only two terminal are used ,one end and the wiper ,it act as a variable resistor or rheostat.
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