I used to call it AC until I was corrected by engineer types that explained to me that AC meant a voltage that alternated from positive to negative polarity and that was not what was happening in ignition systems and lightning.You can if the DC bias is close to 1/2 the peak to peak AC.
The dividing line between AC with a DC bias and DC with close to 100% ripple seems to be different depending on what field you are in. :happyyes:
I am also perfectly happy to call it pulsed DC with ringing as long as the order of magnitude of the pulse frequency and the ringing frequency is part of the discussion.
I have to bow out when it comes to terms like ringing frequency. I am not familiar with that term, thus I don't see the relationship between it and AC/DC differentiations.
Here it is in man on the street terms. AC is voltage that alternates from one polarity to another and that usually happens at a discernible frequency. DC always stays the same polarity, but can be turned on and off, creating and collapsing a magnetic field and taking on the characteristics of AC, while still remaining to be direct current by definition, but turning on and off at a discernible frequency. As opposed to changing polarity at a frequency