Re: A challenge exploding trees

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Tom Stathes by way of Terry Fritz <twftesla-at-qwest-dot-net>" <newphreak_16-at-yahoo-dot-com>

Hello,

Noticed a mistake you made here, lightning is not RF,
it's DC because it is an electrostatic discharge. 
This might also be why it makes the tree explode.  I
remember seeing a 3 phase power relay once that had 2
possible coil voltages, one was for 60hz, and the
second was for 50hz, the 50hz voltage was lower.   As
the frequency goes down the current has more time to
build up, which creates more heat.

--Tom  

 
--- Tesla list <tesla-at-pupman-dot-com> wrote:
> Original poster: "Jim Lux by way of Terry Fritz
> <twftesla-at-qwest-dot-net>" <jimlux-at-earthlink-dot-net>
> 
> 
> ----- > >Have you ever gave a though why some trees
> "explode"
> > >being hit by lightening and not seriously burned
> down
> > >in  same time?
> > >
> > >regards,
> > >Boris
> > >
> > >
> >
> > exploding trees and lightning most definately ... 
> millions of amps at
> > 3+ million volts must = billion joules :)  all in
> 1 second or less  ouch
> >  no wonder why they explode...  but milliamps at 2
> million volts must =
> > 10 mayybeee  20 J.  hot  but not that hot ...
> 
> Lightning is on the order of 10 kA... Around 100
> kJ/meter dissipated in the
> stroke itself and, at that kind of current, the
> voltage drop along the
> channel is around 1000V/meter.  Still... dissipating
> 10's of kJ in a few
> milliseconds is enough to strip the bark off a
> tree..
> 
> >  my question ..  is it the current or voltage in
> the rf form that did it
> > ??   which brings us back to human contact...  it
> must be the "energy" (
> > joules) that will do us in ...  whatya think??
> >
> Indeed.. joules are what kills....  although, given
> finite resistivity,
> current, joules, pulse length, and voltage are all
> interrelated.
> 
> 
> 


__________________________________________________
Do You Yahoo!?
Yahoo! Autos - Get free new car price quotes
http://autos.yahoo-dot-com