What is the difference between the alternating current and direct current?

A direct current flows in one direction only. An alternating current changes direction all the time; for commercially available current, a full cycle typically takes 1/50 or 1/60 of a second.
A direct current flows in one direction only. An alternating current changes direction all the time; for commercially available current, a full cycle typically takes 1/50 or 1/60 of a second.