Question

Name a device that helps to measures the potential difference across a conductor

Answer 1

Voltmeter is an instrument used fro measuring the electric potential difference between two end of conductor.

Voltmeter is always connected parallel in circuit.
Voltmeter should have high resistance as it does not draw current going through circuit.

Now a days we have Multi meters   which are used to measure current, potential difference and resistance.

Answer 2

Answer:

voltmeter that help to measure the potential difference across a conductor