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What is the difference between AC and DC current?

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If an electric current reverses direction cyclically, that's an "alternating current" (AC) (because it alternates between flowing in one direction and flowing in the other direction).

If the direction remains constant, then that's a "direct current" (DC).

In general, electricity you get from a wall socket is AC, and electricity from batteries is DC. (That's just a general rule of thumb, not 100% always true.)

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