Question

what is voltmeter...​

Answer 1

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Electric current flowing in a wire is measured by an instrument called Anmetre and the potential difference across two points in a circuit is measured by an instrument called ${\large{Voltmeter}}$

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Answer 2

an instrument for measuring electric potential in volts....☺

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. ❤ ✌ ❤