In practical electronics, how many terminals (connections) does a potentiometer have for use as a three-terminal adjustable voltage divider?

Introduction / Context:
A potentiometer (pot) is a variable resistor commonly used to adjust signal levels, set reference voltages, and create user controls (e.g., volume knobs). Understanding its terminals is crucial for correct wiring as a rheostat (2-terminal use) or as a voltage divider (3-terminal use).

Given Data / Assumptions:

• Standard rotary or slider potentiometer.
• Used as a voltage divider unless otherwise stated.
• Mechanical wiper provides a variable contact along the resistive track.

Concept / Approach:
A potentiometer has two end terminals connected to the ends of a resistive element and a third terminal connected to a movable wiper. As the wiper moves, it partitions the total resistance into two parts, producing an adjustable output voltage proportional to the wiper position when the end terminals are tied to a fixed potential difference.

Step-by-Step Solution:
Identify terminals: two ends of the resistive track plus one wiper.Wire as divider: connect ends to reference voltages (e.g., Vcc and ground); take output from wiper to obtain a variable fraction of Vcc.Alternative 2-terminal use: short one end to the wiper to act as a variable series resistor (rheostat).

Verification / Alternative check:
Datasheets show three pins labeled A (end), W (wiper), and B (end). Schematics depict the wiper arrow contacting the resistive element.

Why Other Options Are Wrong:
One or two terminals cannot realize a proper voltage divider.

Four or more terminals are found only in specialized multi-gang or dual pots, not a single standard potentiometer section.

Common Pitfalls:
Leaving the wiper floating or miswiring ends can cause noise or full-scale jumps; always reference the wiper correctly.

Final Answer:
3