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 1 volt ? Calculate the amount of work done in shifting a charge of 2 coulombs from a point A to B having potentials 110 V and 25 V respectively.

Answer 1

Electric circuit: The closed path along which an electric current flow is called an 'electric circuit'. The device that helps to maintain a potential difference across a conductor in a circuit are- 

Electric cell, electric battery, electric generator 

1 Volt: The potential difference between two points in an electric field is said to one volt if one joule of work has to be done in bringing a positive charge of one coulomb from one point to another.

= 170 Joule.