"voltmeter." YourDictionary, n.d. Web. 14 January 2019. <https://www.yourdictionary.com/voltmeter>.
voltmeter. (n.d.). Retrieved January 14th, 2019, from https://www.yourdictionary.com/voltmeter
An instrument used for measuring the difference in voltage between two points in an electric circuit. Voltmeters typically make use of an ammeter that measures current flow across a known resistance inside the voltmeter; direct-current voltages can then be determined by Ohm's law. Digital voltmeters employ A/D converters to provide the numerical value of the voltage displayed.
Numerous forms of hot-wire or thermal voltmeter have been devised.
In this case a highresistance wire is connected between the points of which the potential difference is required, and from some known fraction of this resistance wires are brought to an electrostatic voltmeter, or to a movable coil electromagnetic voltmeter, according as the voltage to be measured is alternating or continuous.
In the case of the voltmeter method of measuring power devised by W.