Electric Current


The electric current is produced by the flow of electric charges. The electric current is defined as the rate of flow of charge. If a charge ?q? flows in time ?t?, then electric current

If small charge dq flows in time dt, then instantaneous current,

The S.I. unit of current is coulomb/second called ampere denoted by (A).

Conventionally the direction of current is taken along the direction of flow of positive charge and opposite to the direction of flow of negative charge.

Though electric current has direction but it is a scalar quantity because it does not obey the laws of vector addition.