Question

What does an electric circuit mean? Name a device that help to maintain a potential difference across a conductor in a circuit. When do we say that the potential difference across a conductor 1 volt ? Calculate the amount of work done in shifting a charge of 2 couloms from a point A and B having potential 10 V and 5 V respectively.

Answer 1

Electric circuit: The path in which electrons from a voltage or a current source flow.

$\bullet$ device used to maintain a potential difference across a conductor is called battery.

$\bullet$ when potential difference across a conductor is one volt; then one joule of work is done in moving one unit charge from one place to another.

$\Delta v=\frac{w}{Q}$

$\Rightarrow w=\Delta v.Q$

$\Rightarrow \Delta v=(10v-5v)=5v$

$Q=2c$

$w=5v.2c$

$w=10vc$

$\Rightarrow 10J$.