lightning strike on the computer

Discussion in 'Computer Support' started by jw 1111, Sep 10, 2005.

  1. jw 1111

    w_tom Guest

    Lightning has high power - not high energy. Please refer
    back to high school physics to appreciate the concepts.
    Second, well over 95% of all lightning strikes to trees don't
    even leave an appreciable mark (from the US Forestry Service
    study). The energy content of lightning is typically that
    small. Third, people see damage, then assume all lightning
    has that energy, AND assume all the energy is from lightning.
    That's a lot of assumptions not consistent with what experts
    have learned.

    For example, to put this energy into numerical perspective,
    from:
    http://www.weatherwise.org/qr/qry.lightningpower.html
    Don Kelly in newsgroup sci.physics.electromag on 4 Nov 2000
    entitled "Oddball question":
    Furthermore, the energy dissipation at the strike location
    is made trivial by how well that stuck item is connected to
    earth. Therefore direct lightning strikes even stopped harming
    church steeples starting in 1752. Well earthed lightning rods
    often have no strike indication other than a loud noise after
    that strike. But when so many only see a direct strike to a
    poorly earthed item, (meaning energy dissipation is higher),
    then they assume the direct lightning strike must have high
    energy.

    To better appreciate the concept, one must first learn
    concepts such as ideal current source. Meanwhile, plasma
    fields don't collapse. That is confusing electric and
    magnetic fields with particles (matter) called plasma.

    Without numbers, one has no idea. It is an old propaganda
    technique practiced by Goebals, Radio Moscow, and Rush
    Limbaugh. Forget to provide numbers so that no one will ask
    embarrassing questions. Provided are numbers from those who
    do the work. What really was the source of energy through
    that pipe? Lightning - or a 'follow-through current' that was
    defined in the previous post?

    Keep in perspective. That means numbers. How much current
    can flow through that AC electric wire inside the dwelling
    walls without vaporizing? Up to 300 amps continuous. AND
    hundreds of thousands of amps for a short duration. But
    again, the numbers.

    First define what you consider high energy - the numbers.
    Experts who have studied lightning for their entire
    professional life don't find these high energy numbers that
    myths use to hype fear and loathing. More sources with
    knowledge and the numbers are cited.

    Cited is the example of an exploding power transformer - not
    destroyed by lightning but instead destroyed by AC utility
    power - an example of 'follow-through current' that has high
    energy.
     
    w_tom, Oct 2, 2005
    #21
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