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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.
Example of voltage in a simple direct current (dc) circuit: 1  In this dc circuit, the switch is closed (turned ON). 2  Voltage in the power sourceâthe âpotential differenceâ between the batteryâs two polesâis activated, creating pressure that forces electrons to flow as current out the batteryâs negative terminal. Current reaches the light, causing it to glow. Current returns to the power source.