The potentiometer (or "pot") is a variable resistor.
These are commonly used in electronic devices as a three-terminal resistor with a continuously adjustable tapping point controlled by rotation of a shaft or knob. These variable resistors are known as potentiometers when all three terminals are present, since they act as a continuously adjustable voltage divider. A common example is a volume control for a radio, audio amplifier, or audio mixer.
Written by: NJ2X, Michael Maher