Which one of the following statements most accurately reflects the nature of ac power?

A The current in an ac circuit flows in one direction, but changes value periodically
B The current in an ac circuit flows in one direction at a steady level
C The current in an ac circuit changes direction periodically
D The current in an ac circuit flows in two directions at the same time
E None of the above

Correct Answer: The current in an ac circuit changes direction periodically

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