What Is the Difference Between AC and DC Voltage?


Quick Answer

DC current is direct current, which means electricity only flows in one direction; AC current is alternating current, which means it flows in both directions. Batteries run on DC current, while AC current is what comes in through an electrical plug in the wall.

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Full Answer

One reason alternating current is used for electricity in the home is because it is easy to change the voltage of the power with a transformer. In the United States, what comes out of the wall is 120 volts. Alternating current switches back and forth at a rapid rate; in the U.S. it switches 60 times per second.

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