The flow of electric charge in a periodically reverse direction is known as alternating current (AC). AC is also referred to as “AC Current”. Although this is technically saying the same thing twice “AC Current”.
An alternating current changes its a direction at a periodic interval of time. The alternating current starts from zero, rises to maximum, decreases to zero, then reverses and reaches a maximum in the opposite direction, then again returns to the original value and repeats this cycle infinitely.
The type of alternating current waveform may be sinusoidal, triangular, square, or sawtooth, etc. In most electrical circuits, the typical waveform of alternating current is a sine wave. A typical sine waveform that you might see as an alternating current is shown in the image below.
AC electric power is widely used in industrial and residential applications.
DC electric power is generally used in low-voltage applications. Most electronic circuits need a DC power supply for its operations