Question

Name the devices that helps to maintain a potential difference across a conductor.

Answer 1

Answer:

voltmeter is the device that helps to maintain a potential difference across conductor

Answer 2

Potential difference.

Explanation:

We need a source of electricity to help create and maintain a potential difference across a conductor. Source of electricity can be a cell, battery, power supply, etc. A voltmeter is an instrument used for measuring the electrical potential difference between two points in an electric circuit. Voltmeter is used only to measure the potential difference, but not create or maintain it. A electric source is required for that purpose.