Question
What type of component is often used as an adjustable volume control?
Answer Options
- A) Fixed resistor
- B) Power resistor
- C) Potentiometer
- D) Transformer
Correct Answer: C
Explanation
An adjustable volume control is a variable resistor, specifically known as a Potentiometer (often shortened to ‘pot’). A potentiometer is a three-terminal device used to divide the input voltage (or signal strength) by varying the resistance ratio between its terminals.
As the knob is turned, it physically moves a contact (wiper) along a resistive element. This changes the amount of voltage tapped off the input signal, allowing the operator to smoothly adjust the amplitude (volume) of the audio signal.
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