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Lightning is alternating current...
joestue:
I found some interesting claims on facebook about this. The discussion can be found in the comments here, look for bob brovey
https://m.facebook.com/story.php?story_fbid=pfbid02BRViBwJ8ZpaFFjE16arD1egBxoYqKTLHYCXsA7ddyU6TCCFuYwW6FAHEQzirQ77rl&id=100044730201835&mibextid=Nif5oz
Seems nonsense to me, i have never heard of this. Of course, multiple restrikes in a tenth of a second is 10 to 100hz.. ac.. but still a net negative (or positive) dc current.
SparWeb:
Um, sounds ironic, but, don't believe everything you read on the internet, Joe. Especially on a forum!
;)
So if I had to give it a name it would be "transient" current, not DC or AC because both of those two terms assume some sort of stability.
Mary B:
It is considered to be an AC source of 100'f of khz to a few mhz frequency... why all my lightning protection systems are designed with AC shunts and not DC only.
joestue:
--- Quote from: Mary B on April 04, 2023, 11:43:12 AM ---It is considered to be an AC source of 100'f of khz to a few mhz frequency... why all my lightning protection systems are designed with AC shunts and not DC only.
--- End quote ---
well yes, even a square wave is a series of harmonics..
lightening has such a fast rise time you can induce MHZ frequencies in everything around it.
OperaHouse:
All current is AC. DC is just slow AC.
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