Voltmeter

A moving coil galvanometer of the d'Arsonval type.
The red wire carries the current to be measured.The restoring spring is shown in green.N and S are the north and south poles of the magnet.

Two digital voltmeters. Note the 40 microvolt difference between the two measurements, an offset of 34 parts per million.

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.

单词	Valve voltmeter
释义	Valve voltmeter 英语百科 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.
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Valve voltmeter

Voltmeter