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