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lightning

Discussion in 'Electronic Basics' started by [email protected], Jul 2, 2006.

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  1. Guest

    When lightning strikes the ground, is the ground always more positive?

    Why doesn't lightning ever go upwards?

    Why is it unsafe to stand under a tree?
     
  2. Chris

    Chris Guest

    Hi, Bob. Most of the time, earth is more positive. However, "positive
    lightning" (less than 5% of all lightning strikes) are the reverse.

    Lightning goes both upwards and downwards.

    Trees have hollow, water-filled cells, and as such can be a better
    conductive path than the surrounding air.

    There's quite a bit of good basic information in the Wikipedia article
    on lightning:

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

    Good luck
    Chris
     
  3. Tim Williams

    Tim Williams Guest

    You can calculate the voltage produced across a given width of ground (say,
    the distance between your feet when standing!) when a lightning bolt
    strikes. A couple ten thousand amperes can develop a lot of voltage,
    especially with a fast event like a lightning bolt.

    Tim
     
  4. When the lightning current goes through the tree, the water inside the
    wood instantly boils, causing the tree to explode like a bomb.
     
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