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Demonstration voltmeter. A voltmeter is an instrument used for measuring electrical potential difference between two points in an electric circuit. Analog voltmeters move a pointer across a scale in proportion to the voltage of the circuit; digital voltmeters give a numerical display of voltage by use of an analog to digital converter. A voltmeter in a circuit diagram is represented by the letter V in a circle.
For the measuring instrument, see Potentiometer (measuring instrument) . A potentiometer /pÉµËtÉnÊiËÉmÉ¨tÉr/ , informally a pot, 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.The measuring instrument called a potentiometer is essentially a voltage divider used for measuring electric potential (voltage); the component is an implementation of the same principle, hence its name.or the measuring instrument, see Potentiometer (measuring instrument) . A potentiometer /pÉµËtÉnÊiËÉmÉ¨tÉr/ , informally a pot, is a three-terminal resistor with a sliding or rotating contact that forms an adjustable voltage divider.