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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.
At the core of any analog ammeter or voltmeter is a galvanometer. By itself, a gal-. vanometer is a very sensitive ammeter: typically, it takes only 100 ÂµA to make the gal-. vanometer arrow move all the way across the scale. The picture below gives the schematics. of the DâArsonval / Weston type of a galvanometer: