Electronic Principles
Which one of the following devices is most often used for measuring opposition to current flow in a circuit?

Wattmeter
Voltmeter
None of these
Ammeter
Ohmmeter

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

The current in an ac circuit changes direction periodically
The current in an ac circuit flows in one direction, but changes value periodically
None of these
The current in an ac circuit flows in one direction at a steady level
The current in an ac circuit flows in two directions at the same time

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