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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 Current (DC) 1  DC is defined as the âunidirectionalâ flow of current; current only flows in one direction. 2  Voltage and current can vary over time so long as the direction of flow does not change. T. 3  o simplify things, we will assume that voltage is a constant.