Electronic Principles
Which one of. the following phrases most accurately describes the nature of a pulsating dc voltage?

The voltage reverses polarity periodically
The voltage remains at one polarity and at a steady level
The voltage causes current to flow in two directions at the same time
None of these
The voltage remains at one polarity but changes value periodically

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Electronic Principles
The rms value of a sine waveform is:

the time required to complete one full cycle
None of these
equal to 0.707 times the peak amplitude
the number of cycles completed in one second
equal to 1.41 times the peak amplitude

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