ka4hjh at gte.net
Thu Aug 3 06:46:57 CEST 2000
>Lightning is DC, but usually there are many strokes at one time and
>they do not have to have the same polarity...
Clouds are positively charged, so the current in a ground strike
usually flows from earth to cloud. The "feeler", however, usually
travels down from the cloud to the ground.
Got a kite handy, Harry? I saw this experiment on TV once done by
some old dude wearing these kooky glasses...
>Rory McDonald wrote:
>> I just saw an interesting piece on Lightning striking humans on CNBC and
>> made me wonder-is Lightning AC or DC? I know that the voltages can be huge.
>> Some woman on the show got hit 3 times in her lift and lived to tell the
> > Rory
You're talked pulsed DC here, with pretty fast risetimes. Combine
that with the high voltage potential and you have a current source
that can worm its way into all sorts of odd places. And then there's
the current available. Enough to melt/blast/fry everything in its
If she was actually INSIDE a lift that was a good place to be. The
fellow who had the world's record for being hit by lightening was a
Park Ranger near here (Shenadoah Valley of Virginia). Eight confirmed
strikes! Once while sitting inside a vehicle!
The anxiety got so bad he killed himself...
For those who insist on some DIY content check out "Things to do with
a 25000 Joule capacitor..." and "Alien Capacitor Autopsy" at
Terry Bowman, KA4HJH
"The Mac Doctor"
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