Definition of the word potentiometer

The term "potentiometer" stems from the Greek words "ponos" (work or effort) and "metron" (measuring instrument). It describes an electrical component that allows you to measure voltage and adjust it like a variable resistor. The potentiometer's resistance changes in proportion to a mechanical movement, such as a knob or slider, so it is also sometimes referred to as a variable resistor. In other words, by turning the knob or sliding the slider, you can progressively change the resistance value and, consequently, the voltage that appears between the two outer terminals of the device. This is why the potentiometer has been historically used for precision voltage measurement and adjustment in various applications, such as in electronic instruments, audio amplifiers, and power supplies.