lightning - Page 2 - Electronic Circuits Projects Diagrams Free

Willbe · 27th August 2008, 01:39 PM

Quote:

Originally Posted by rjvh

sand that was turned into kinda glass

http://en.wikipedia.org/wiki/Fulgurite

neon · 29th August 2008, 07:43 PM

Quote:

Originally Posted by Hero999

That's true but where did I say otherwise?

Perhaps you've either misread my post or quoted the wrong post.

you say above persons conduct better then trees.? i suggest that is because of dirt on clothes and evidence shows there is burnt clothes not holes in people heads. and trees for sure have more dirt on their bark then us on our skins. but there maybe some exceptions to the rule.

Hero999 · 29th August 2008, 07:55 PM

I don't know about you but my skin is a better conductor than the cotton, nylon, acrylic, PVC clothes and I've never measure a tree but it's a safe bet to assume I'm more conductive than a tree.

Every piece of advice regarding lightning protection strongly recommends not standing under a tall tree.
http://www.weneedtostop.com/2008/07/...g-while-s.html
http://www2.hurlburt.af.mil/news/story.asp?id=123108096
http://www.golfcst.com/Default_new.htm

Willbe · 29th August 2008, 08:55 PM

Quote:

Originally Posted by neon

you say above persons conduct better then trees.? i suggest that is because of dirt on clothes and evidence shows there is burnt clothes not holes in people heads. and trees for sure have more dirt on their bark then us on our skins. but there maybe some exceptions to the rule.

Some trivia:
The tree sap turns to steam instantly and causes the tree to explode when hit by lightning, so I guess the sap is the conductor.
I don't know the volume resistivity of tree sap.
The voltage, current and energy of lightning strike is readily available.

The IEEE standard equivalent circuit for a person is 1500 Ω in parallel with 0.1 µF, if memory serves me.
The skin is supposedly punctured by voltages >600v, and I have confirmed this.

rjvh · 30th August 2008, 05:12 AM

Quote:

Originally Posted by Willbe

The skin is supposedly punctured by voltages >600v, and I have confirmed this.

It's a lesser nr of voltage

out of experiance I did catch a flash on my finger from a short out and it left me with a burst blister on my finger and that whas 380V

thanks for the earth leakage protection in place

Robert-jan

Bob Scott · 31st August 2008, 09:28 PM

Quote:

Originally Posted by neon

clouds because of friction of molecluoles biuld up a voltage charge and just sits there charged like a big capacitor waiting to find a path of less resistance to breakdown. the path can be any where another cloud earth any point that it can discharge the potential. when that happens because of the massive charge miles of cloud it discharges with millions of amperes for a very short duration. that generated heat sand can become glass or burn a hole in a tree. or if you lucky and wet it can pass on your dirty clothes and dissipate to ground.

They also taught me in elementary school that the "friction" caused the charge build-up. Later I learded that the clouds become negatively charged due to the "photoelectric effect" as explained by Einstein. When photons stike the clouds, the photons are absorbed and are converted to or create electrons.

Neon: I tried to give you some positive feedback. There is no "scale" or "cauliflower" icon for you. Could the moderator please un-ban this guy?

Sceadwian · 31st August 2008, 11:09 PM

http://en.wikipedia.org/wiki/Lightning

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29th August 2008, 07:55 PM	#18
Hero999	I don't know about you but my skin is a better conductor than the cotton, nylon, acrylic, PVC clothes and I've never measure a tree but it's a safe bet to assume I'm more conductive than a tree. Every piece of advice regarding lightning protection strongly recommends not standing under a tall tree. http://www.weneedtostop.com/2008/07/...g-while-s.html http://www2.hurlburt.af.mil/news/story.asp?id=123108096 http://www.golfcst.com/Default_new.htm __________________ I do not answer private messages asking for help because no one else can: benefit from advice I may give or correct me if I'm wrong. Please ask on the open forum if you have a question and I'll be happy to help, if I know the answer.

31st August 2008, 11:09 PM	#22
Sceadwian	http://en.wikipedia.org/wiki/Lightning __________________ "Because I be what I be. I would tell you what you want to know if I could, mum, but I be a cat, and no cat anywhere ever gave anyone a straight answer, har har."