In a previous article, we discussed various types of fixed resistors, selection of resistor type for a given circuit, and identifying value, tolerance and power rating of fixed resistors. Let’s now talk about variable resistors. The resistance of variable resistors can be adjusted manually or digitally. The variable resistors offer a range of resistance instead…

Potentiometer also known as pot is generally used in circuits to provide variable resistance or variable voltage. The heart of the potentiometer is a resistive strip inside it through which one can adjust the amount of resistance/voltage to pass in a circuit through it. When we rotate the external shaft, the position of the brush varies accordingly. The resistance applied in a circuit depends on the position of the brush. The brush is designed so as to connect the resistive strip to the middle terminal via inner conductive circular metal plate which in turn is connected to the middle terminal of potentiometer at every instant.