A voltmeter is used to measure
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Voltmeter - The device used to measure the electric potential difference between two points in an electric circuit is called a voltmeter. It is linked simultaneously. It typically has a high resistance such that it uses very little circuit current.
A galvanometer and a series resistor can be used to make analogue voltmeters, which move a pointer across a scale in proportion to the voltage detected. Microvolts or less can be measured by metres that use amplifiers. Digital voltmeters employ an analog-to-digital converter to display voltage as a numerical value.
Voltmeters come in a broad variety of designs, some powered independently (by a battery, for example), and some powered directly by the source of the voltage being measured.
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