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Does a potentiometer need a resistor?
A potentiometer is a three-terminal resistor with a sliding or rotating contact that forms an adjustable voltage divider. If only two terminals are used, one end and the wiper, it acts as a variable resistor or rheostat.
What is potentiometer principle?
The principle of a potentiometer is that the potential dropped across a segment of a wire of uniform cross-section carrying a constant current is directly proportional to its length. The potentiometer is a simple device used to measure the electrical potentials (or compare the e.m.f of a cell).
What do you need to know about potentiometers?
Electronics Basics – How a Potentiometer Works. A potentiometer also referred to as pot may come in a wide variety of shapes and are used in many applications in your daily life, for example to control the audio volume of the radio. A pot is a manually adjustable variable resistor with three terminals.
How is a potentiometer connected to a wiper?
Two terminals (the blue and green) are connected to a resistive element and the third terminal (the black one) is connected to an adjustable wiper. The potentiometer can work as a rheostat (variable resistor) or as a voltage divider.
How is the potentiometer a variable voltage divider?
The potentiometer essentially functions as a variable voltage divider. The resistive element can be seen as two resistors in series (potentiometer resistance), where the wiper position determines the resistance ratio of the first resistor to the second resistor.
How is the resistive track of a potentiometer connected?
At the start and end of travel, the resistive track of a potentiometer is connected to low resistance metal parts which connect the resistive element to the end terminals. The change in resistance when the wiper enters or exits the resistive track is known as the hop-on and hop-off resistance.