Chapter 3: ELECTRICAL SAFETY question

Discussion in 'Feedback and Suggestions' started by Unregistered, Jan 12, 2009.

  1. Unregistered

    Thread Starter Guest

    Chapter 3: ELECTRICAL SAFETY
    Shock current path page

    Hi I had a question about one of the grounded circuits (The circuit with the 2 people separated by the resistor and the tree touching the top wire) Shock current path page
    -top person is safe and bottom person gets shocked

    My question is why doesn’t the current flow threw the two people and shock both of them instead of flowing threw the tree and the person at the bottom. There is a voltage difference between both people due to the resistor. How is this different then the voltage difference between the person on the bottom wire and the tree due to the power source?

    Any feedback will be much appreciated thanks.
     
  2. Wendy

    Moderator

    Mar 24, 2008
    20,765
    2,536
    Draw the current paths, it will make more sense. The tree is also a resistor.

    I assume you are talking about this picture.

    [​IMG]

    By the way, there is a requirement to register if you want to ask questions and get involved. Nothing private is given away, and it is free.
     
  3. leftyretro

    Active Member

    Nov 25, 2008
    394
    2
    I really dislike these pictographs of circuit diagrams for explaining electrical properties. As we saw in a prior posting using them, it leads to so many different impressions and explanations and certainly doesn't seem to help some beginners but rather confuses them. A picture may be worth a thousand words but sometimes a few simple words are better then a bad picture.

    If you don't understand it then don't go touching no stinking wires :cool:

    Lefty
     
  4. Wendy

    Moderator

    Mar 24, 2008
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    We could always show a TV antenna touching some wires, that kills more than its far share of people.

    I think the tree being a conductor is what is throwing people off.
     
  5. thingmaker3

    Retired Moderator

    May 16, 2005
    5,072
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    Looking at the picture for the umpteenth time, I find myself wondering why no current goes through the top person to ground and then through the bottom person... The two people form a series circuit in parallel with the load... One of them is also in parallel with the tree.
     
  6. Wendy

    Moderator

    Mar 24, 2008
    20,765
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    Because the tree is grounded, and is ground. If it were a wire it would be obvious.
     
  7. Dave

    Retired Moderator

    Nov 17, 2003
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    Bill, is right with this one, the tree is what throws people. The paragraph after the above picture explains why:

    Dave
     
  8. thingmaker3

    Retired Moderator

    May 16, 2005
    5,072
    6
    Tree. Yes. Duh. Conductor not resistor.

    Redrawn:
    birdie.jpg
     
  9. Dave

    Retired Moderator

    Nov 17, 2003
    6,960
    144
    So how many volts is that across the supply? :D

    Dave
     
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