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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.
An ammeter measures current; a voltmeter measures the voltage between two points; and an ohmmeter measures resistance. A multimeter combines these functions into a single instrument. A multimeter can be used to measure voltage, current and resistance in an electrical circuit that uses resistors and capacitors. To understand how to use a multimeter with these components, schematic symbols for resistors, capacitors and other electronic schematic symbols need to be readily recognized.