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

The current in an ac circuit flows in two directions at the same time
The current in an ac circuit changes direction periodically
None of these
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

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Electronic Principles
Which one of the following principles best describes the basic operation of a generator?

None of these
Current flowing through a conductor generates a magnetic field
Like magnetic poles attract; unlike poles repel
Current is induced in a conductor that is moving through a magnetic field
Like magnetic poles repel; unlike poles attract

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Electronic Principles
Waveforms are graphs that show:

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

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