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

None of these
The current in an ac circuit flows in one direction, but changes value periodically
The current in an ac circuit changes direction periodically
The current in an ac circuit flows in two directions at the same time
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 statements is true for the impedance of a series RC circuit?

The impedance is less than the sum of the resistance and capacitive reactance
The impedance is equal to the sum of the resistance and capacitive reactance
The impedance is greater than the sum of the resistance and capacitive reactance
None of these
The impedance is greater than either the resistance or capacitive reactance but less than their sum

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Electronic Principles
The peak value of a sine waveform is:

the amplitude at 70.7% of the maximum value
the amplitude at 90% of the maximum value
the amplitude at 1.41 times the maximum value
None of these
the maximum positive or negative value

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