Alternating current (AC) electricity alternates its direction in a back-and-forth motion, alternating between 50-60 times per second. AC electricity is commonly used in homes and businesses. Direct current (DC) electricity flows in one direction through a wire.
The most common form of DC electricity is a battery. In the past, DC current lost much of its carrying capacity over long distances, while AC current did not, making the latter the ideal choice to supply our electricity. Newer technologies have made transmission of DC current as cost-effective and efficient as AC current, but AC current can be distributed across the grid with great ease than DC current.
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