<Table> <Tr> <Td> </Td> <Td> This article needs additional citations for verification . Please help improve this article by adding citations to reliable sources . Unsourced material may be challenged and removed . (June 2009) (Learn how and when to remove this template message) </Td> </Tr> </Table> <Tr> <Td> </Td> <Td> This article needs additional citations for verification . Please help improve this article by adding citations to reliable sources . Unsourced material may be challenged and removed . (June 2009) (Learn how and when to remove this template message) </Td> </Tr> <P> Direct current (DC) is the unidirectional flow of electric charge . A battery is a good example of a DC power supply . Direct current may flow in a conductor such as a wire, but can also flow through semiconductors, insulators, or even through a vacuum as in electron or ion beams . The electric current flows in a constant direction, distinguishing it from alternating current (AC). A term formerly used for this type of current was galvanic current . </P> <P> The abbreviations AC and DC are often used to mean simply alternating and direct, as when they modify current or voltage . </P>

Whats the difference between ac and dc electricity
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