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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.
Voltage is meaured using a voltmeter. Some types of voltmeter have a pointer on a dial, but most have a digital readout. To measure the voltage across a component in a circuit, you must connect the voltmeter in parallel with it.Using a voltmeter to measure the voltage across a lamp. You can measure the voltage across a cell or battery.The more cells, the bigger the voltage.o measure the voltage across a component in a circuit, you must connect the voltmeter in parallel with it. Using a voltmeter to measure the voltage across a lamp. You can measure the voltage across a cell or battery. The more cells, the bigger the voltage.