General Definitions of AC and DC

The term AC refers to "alternating current" while DC refers to "direct current". So what's, or watts, the difference (we'll get to watts in a minute ;)

Direct current, or DC, is an electric current that flows "steadily" in one direction from positive to negative (current flow) or from negative to positive (electron flow). A common battery is an example of a device that produces direct current.

Alternating current, or AC, is an electric current that flows in a positive, then negative direction and repeats, usually at a fixed rate or frequency. Normal 110 VAC (volts alternating current), 60 Hz household current is an example of alternating current.

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