What a potentiometer is
A potentiometer is an adjustable resistor - a component whose resistance can be changed by turning a knob or moving a slider. By adjusting it, you can vary the amount of resistance in a circuit, which in turn can change a voltage or control a setting. Potentiometers are the components behind many of the knobs and sliders used to make adjustments on electronic devices.
An adjustable resistor
Unlike a fixed resistor, which always provides the same resistance, a potentiometer can be adjusted. It has a movable part that, when turned or slid, changes the resistance between its terminals. This adjustability is the potentiometer's defining feature, letting a user or a circuit change a value on demand rather than being stuck with a single fixed amount of resistance.
Dividing voltage
A common way a potentiometer is used is as a way to divide voltage, producing an adjustable output voltage from a fixed input. As the control is turned, the output voltage changes smoothly. This makes potentiometers handy for setting levels, such as adjusting how strong a signal is. The ability to produce a variable voltage from a simple turn of a knob is widely useful.
Knobs, sliders, and controls
Many of the physical controls people interact with, like a volume knob or a brightness slider, are potentiometers underneath. Turning the knob or moving the slider adjusts the potentiometer, which changes the setting it controls. This direct, tactile way of making adjustments is why potentiometers are so common in devices that need manual control of a value.
Where potentiometers are used
Potentiometers appear in audio equipment, appliances, instruments, and many other devices where an adjustable setting is needed. They are used both as controls that people operate and, in some cases, as sensors that detect position. Their simple ability to provide a variable resistance has kept potentiometers in widespread use across many kinds of electronics.
Why it matters
The potentiometer is a simple but widely used component that puts adjustable control into electronics. Understanding what a potentiometer is - an adjustable resistor used to vary voltage or settings - clarifies how the knobs and sliders on devices actually work. For anyone interested in electronics, it is a handy concept to understand.
Related on Skillo
See also: What is a resistor? Explained simply, What is a capacitor? Explained simply.
Sources
Published date reflects the original event date (2024-02-06). This article is original Skillo editorial written from the sources above; facts were verified in September 2026.
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