Why Use A Variable Resistor

You use a potentiometer when you want to vary the amount of current or voltage youre supplying to part of your circuit. A potentiometer or pot for short is also known as a variable resistor.

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This technique takes an average of the values of resistance for each pair of p q and allows you to check that ohms law vir or qip is valid.

Why use a variable resistor. Uses of variable resistors. Variable resistors are used to dynamically change the resistance to control the current in a circuit and may also be used as a voltage divider. A variable resistor can be used mainly in two different ways.

A variable resistor is used because a potential divider with 3 terminals is known as a potentiometer. A variable resistor commonly called a potentiometer pot for short allows you to adjust the resistance from virtually zero ohms to a factory determined maximum value. The variable resistor is used to vary the current p in the circuit.

Its correct name is variable resistor while the terms potentiometer. An electronically controlled variable resistor controls electronically instead of using mechanical action. This resistor is called a digital potentiometer.

This enables you to obtain several pairs of values of p q so that you can plot a straight line graph of q vs p to get r slope. For example they are used to control the volume in a radio. When one end of resistance track and wiper terminal is connected with circuit then current through the resistor limits according to the position of the wiper contact on the resistance track.

When it has two terminals it acts as a variable resistor which is known as a rheostat. Answer a variable resistor may function as a potentiometer using three terminals or as a rheostat using two terminals.

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