Electronic Principles
Waveforms are graphs that show:

amplitude on the vertical axis and frequency on the horizontal axis
the passage of time on the vertical axis and amplitude on the horizontal axis
frequency on the vertical axis and amplitude on the horizontal axis
amplitude on the vertical axis and the passage of time on the horizontal axis
None of these

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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
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
None of these

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