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In direct current (DC), the electric charge (current) only flows in one direction. Electric charge in alternating current (AC), on the other hand, changes direction periodically. The voltage in AC circuits also periodically reverses because the current changes direction. Most of the digital electronics that you build will use DC.
Direct and Alternating Current. There are two different ways that electricity is produced, and they are used in most cases for very different purposes. They can also be converted from one form to another, as discussed in this section. The first and simpler type of electricity is called direct current, abbreviated DC.