What type of component is often used as an adjustable volume control?

A potentiometer, commonly referred to as a 'pot,' is a type of variable resistor. It features a mechanical dial or slider that moves a contact across a resistive element, allowing the user to seamlessly adjust the resistance. This makes it the standard component used for user-adjustable controls like audio volume. Fixed resistors and power resistors have a set resistance value and cannot be adjusted on the fly. Transformers are used for stepping voltage up or down and matching impedance, not for simple, continuous user adjustments like a volume knob.