Electric Current

What is Electric Current?

The rate of flow of charge with time through any conductor is called as electric current. It is denoted by ‘I‘.

If ‘q’ charge crosses any conductor in time t, then

I = q/t ……………….(i)

If ‘dq’ be the variation in charge in time dt, then

I = dq/dt ……………….(ii)

Direction of Current:

By convention, the direction of flow of positive charge is taken as the direction of the current. This is called conventional current. It should be noted that electrons flow in a direction opposite to conventional current. It should again be noted that current is a scalar quantity.

Types of Current:

There are three types of current-