Potentiometers (variable resistors), etc.

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Potentiometers are used in electronic circuits for the following purposes:
Volume Control:
Used to adjust the level of analog signals, such as volume knobs on audio equipment.
Brightness Adjustment:
Used to adjust the intensity of light, such as for dimming lighting fixtures or adjusting display brightness.
Position Detection:
Functions as a sensor that converts mechanical position into electrical signals, such as detecting the angle of a robot arm or operating a joystick.
Voltage Divider:
Used to divide voltage by adjusting resistance to obtain a specific voltage within a circuit.
Adjustment Component:
May be incorporated as a component for fine-tuning during the adjustment and calibration of electronic circuits.