AC current periodically reverses direction and changes its magnitude continuously with time in contrast to DC current, which flows only in one direction. Direct current (DC) refers to the unidirectional flow of electric charge carriers in one direction only, while alternating current (AC) is the periodic reversal of the flow of electric charge present in the form of electrons in a conductor. The key difference between AC and DC is that AC periodically reverses direction and changes its magnitude continuously whereas DC flows only in one direction.

1. AC and DC current
By udaya prakash

2. Alternating current(AC)

6. Direct current(DC)