出典:Wikipedia
出典:『Wikipedia』 (2011/06/18 18:24 UTC 版)
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
a sensitive voltmeter
a geometer
a gauge
ガス・メートル
a meter
an instrument for measuring an electric current, called ammeter
a steam-gauge
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