Electronics - Alternating Current vs Direct Current - Discussion


If current varies periodically from zero to a maximum, back to zero, and then repeats, the signal is:

[A]. direct
[B]. alternating
[C]. pulsating
[D]. repetitive

Answer: Option C


No answer description available for this question.

Kuday said: (Aug 22, 2013)  
Because if signal does not vary periodically from +ve to -ve. It is pulse.

Dcdon said: (May 7, 2014)  
So how then do we describe direct current signal?

Roxy said: (Feb 27, 2021)  
A pure direct current is a signal that has a constant value. It may be positive or negative but not both.

A pulsating direct current is a result from rectification of AC to DC since the alternations are not completely smoothen out and there is a need for further filtration and regulation to keep it on a constant level.

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