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Why, Alternating Current and Direct Current, of course! Both AC and DC describe types of current flow in a circuit. 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.
Direct current and alternating current have different advantages and disadvantages that make them useful for different applications. Most consumer electronic devices, like cellphones, flat screen TVs and even electronic cars, operate with direct current.