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DC has no frequency, being a steady voltage. Pulsed DC gives the cycle aspect that mimics frequency. PWM - power wave management or duty cycle. Such a power pack hardly constitutes a true DC source....

Sinusoidal waveforms seem so complicated but it is not really. The title of an average electrical textbook would make it far clearer: Rotating Machines. It is the circular motion of electrical...

That meter does not measure DC, only AC. His source is also AC. A capacitor will always develop a charge exposed to an AC circuit. I did not see any pulsed DC apparatus. What does he mean by pulsed...