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AC Circuit: Evaluating Current and Voltage

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Hi. Can I get some help with understanding this conceptual question?

Question: Why is the current in an ac circuit not always in phase with its voltage?

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This solution consists of the information required in order to gain an understanding for the concept being described in the following physics question. This is done in about 50 words.

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The current will be in phase with the voltage only if the impedance is pure ...

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