Electronic Principles
The period of a waveform is:

the number of cycles completed in one second
None of these
the time required for the voltage to rise from 10% to 90% of the peak amplitude
equal to 0.707 times the peak amplitude
the time required to complete one full cycle

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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 flows in one direction, but changes value periodically
None of these
The current in an ac circuit changes direction 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

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