AC AND DC CURRENTS

AC CURRENT

The alternating current which is abberivated as  AC  is that current which changes it polarity and reverses it direction periodically.Alternating Current (AC) flows one way, then the other way, continually reversing direction. An AC voltage is continually changing between positive (+) and negative (-).
                                 The rate of changing direction is called the frequency of the AC and it is measured in hertz (Hz) which is the number of forwards-backwards cycles per second.
Mains electricity in the pakistan  has a frequency of 60Hz.

DC CURRENT

The Direct current which is abberivated as  DC  is the linear one direction current and it is the one way current.its level is always positive or negative . Electronic circuits normally require a steady DC supply which is constant at one value or a smooth DC supply which has a small variation called ripple. Cells, batteries and regulated power supplies provide steady DC which is ideal for electronic circuits. Many  home devices operates at DC.