A potentiometer is a part of a radio 


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A potentiometer is a variable tapped resistor that can be used as a voltage divider. A form of potentiometer is used as an instrument to  measure potential  or voltage in a circuit. Potentiometer are actually used to control the volume of a radio. The sliding tape of the potentiometer is adjusted. A potentiometer describes 3 terminal resistor. If all 3 terminal resistor are used, it will act like a variable voltage divider. If only 2 terminal resistor are used it will act as a variable resistor.