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

• A. Capacitor
• B. Transformer
• C. Potentiometer
• D. Resistor

Answer: (C)

A potentiometer is a variable resistor that is commonly used as an adjustable volume control in audio equipment and other electronic devices. It consists of a resistance element and a wiper that slides along this element. By adjusting the position of the wiper, you can change the resistance and thus control the amount of current flowing through the circuit, effectively adjusting the volume of the audio signal.

In contrast, capacitors are used to store electrical energy and filter signals but do not provide adjustable resistance. Transformers serve to change the voltage and current levels in AC circuits but do not function as adjustable components themselves. Resistors offer fixed resistance values and cannot be adjusted on the fly, making them unsuitable for volume control applications where variable adjustment is necessary. Therefore, the potentiometer is uniquely suited for applications requiring variable control, like volume adjustment.