Question

Name a device that helps to maintain a potential difference across a conductor.

Answer 1

Answer: A battery consisting of one or more electric cells is used to maintain a potential difference across a conductor.

Answer 2

When it comes to battery, it comes with more than one electric cell which is used for maintaining a major difference across the conductor.

Every source of energy such as power supply, battery and cell aids us in maintaining the potential difference across the conductor.  

There are tons of energy sources available in the present world.