Basically a potentiometer is a device for

The correct answer is: D. measuring a voltage.

A potentiometer is a three-terminal resistor with a sliding or rotating contact that forms an adjustable voltage divider. If only two terminals are used, one end and the wiper, it acts as a variable resistor or rheostat. If only one terminal is used, it acts as a voltage divider.

Potentiometers are commonly used to control electrical devices such as volume controls

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