- An instrument for controlling electrical potential. Measures an unknown voltage by comparing it to a standard voltage.
- A variable resistor incorporating a sliding contact or tap, so as to allow a variable proportion of the total resistance to be included in a circuit. It is usually utilized as a potential divider.
- A potentiometer (1) used as a volume control.
- A device or instrument which incorporates one or more calibrated resistors, and which is utilized to measure unknown potential differences when compared with a precisely known potential difference, such as that of a standard cell.