Answer:

Electric current flows in two ways as an alternating current (AC) or direct current (DC).

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A video comparing Alternating Current and Direct Current.

Alternating Current. Direct Current

The frequency of AC is depended upon the country. But, generally, the frequency is 50 Hz or 60 Hz. DC has no frequency of zero frequency.

Alternating current (AC)

Alternating current (AC) is an electric current which periodically reverses direction and changes its magnitude continuously with time in contrast to direct current (DC) which flows only in one direction. These currents typically alternate at higher frequencies than those used in power transmission.

Direct Current (DC)

Direct current (DC) is one-directional flow of electric charge. An electrochemical cell is a prime example of DC power. The electric current flows in a constant direction, distinguishing it from alternating current (AC). A term formerly used for this type of current was galvanic current.