Question

what does an electric circuit mean? name a device that helps to maintain a potential difference across a conductor in a circuit. when do we say that the potential difference across a conductor is 1volt? calculate the amount workdone in shifting a charge of 2 coulombs from a point A to B having potentials 110v and 25v respectively.

Answer 1

Voltmeter helps to maintain a potential difference across a conductor in circuit.

Answer 2

Cell or battery eliminator is a device which helps to maintain a potential difference across a conductor