name a device that helps to measure the potential difference across a conductor??

A voltmeter helps to measure the potential difference across a conductor.To measure voltage we connect the voltmeter in parallel so that we measure the voltage drop across a load. Also, voltmeter has high value of resistance causing potential drop across the circuit which is not required. 

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Voltmeter is a device that helps to measure the potential difference across a conductor??

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voltmeter

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