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Question
Which one of the following statements most accurately reflects the nature of ac power?
Options:
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
Answer: Option C

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