Electric Current and Circuit


The charge is an intrinsic property of matter by virtue of which it can exert electromagnetic force.

Conductors and Insulators

A substance that offers comparatively less opposition to the flow of current is known as a conductor, and substances that offer larger opposition are called insulators.


Electric Current is the rate of flow of electric charges in a conductor. The SI Unit of electric current is the Ampere.

If a net charge Q, flows across any cross-section of a conductor in time t, then the current I, through the cross-section is

I = Q / t