<Table> <Tr> <Td> </Td> <Td> This article is an orphan, as no other articles link to it . Please introduce links to this page from related articles; try the Find link tool for suggestions . (March 2017) </Td> </Tr> </Table> <Tr> <Td> </Td> <Td> This article is an orphan, as no other articles link to it . Please introduce links to this page from related articles; try the Find link tool for suggestions . (March 2017) </Td> </Tr> <P> Leading and lagging current are phenomena that occur as a result of alternating current . In a circuit with alternating current, the value of voltage and current vary sinusoidally . In these types of circuits, the terms lead, lag, or in phase are used to describe current with reference to voltage . Current is in phase with voltage when there is no phase shift between the sinusoids describing their time varying behavior . This generally occurs when the load drawing the current is resistive . </P> <P> In electric power flow, it is important to know whether current is leading or lagging because they can be used to describe how much circulating current or reactive power flow is occurring in the system . They can also play an important role in the operation of three - phase power systems . </P>

What is meant by lagging and leading current in ac circuit
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