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Why Does AC Current Reverse Direction Periodically? Understanding Alternating Current generation, Frequency, and Working Principle of an AC generator The answer to this question goes back to the generator where AC power is generated. A simple voltage generator: Imagine a simple loop of coil is rotating between the two strong magnetic bars. 0 to 180 degrees,i.e. Half rotation. You will notice that when the coil is perpendicular to the magnetic field, its output is minimum or zero due to the minimum linkage of the magnetic field. But as the coil rotates to become parallel to the magnetic field, its output increases and becomes maximum when it is parallel. 180 to 360 degrees, i.e. Full rotation. The same cycle repeats, but now the voltage is negative. The following diagram explains it. Hence, as the AC voltage reverses its polarity periodically, the load current will also change direction of flow periodically. AC current direction: FAQ Set: Q1: Why does AC current reverse direction p...