Please a lil help here,quick question

Discussion in 'General Electronics Chat' started by naruto, Jul 2, 2010.

  1. naruto

    Thread Starter New Member

    Jul 2, 2010
    3
    0
    watch these pics:
    [​IMG]
    [​IMG]

    Notice that they are not at the same time.
    so my question is: what does the "temporally ground" thingy does?
    u wont get shocked anyways... :S
     
  2. Wendy

    Moderator

    Mar 24, 2008
    20,765
    2,536
    Those pictures didn't come from our book I don't think. The second one is incorrect, the brown dude is a dead man if the second switch is open. If it is closed there lots of fire and smoke, as the power source is shorted. The second switch and load are irrelevant.

    In the first illustration is either switch is closed the other dude is dead, and if both are closed the third guy's a gonner. He ain't gonna be too happy anyhow, as he is shocked in two of three scenarios.
     
  3. naruto

    Thread Starter New Member

    Jul 2, 2010
    3
    0
    ok, i think i got it. Green and brown are dead.
    but dont u think that the "temporary short wire" is NOT necessary?

    btw i got this pic from :http://www.allaboutcircuits.com/vol_1/chpt_3/5.html
    and i painted those dudes cuz i got confuse with that "electrical common" and "temporary ground" things.
    thx a lot for help!
     
  4. Wendy

    Moderator

    Mar 24, 2008
    20,765
    2,536
    Basically a load to ground with the power disconnected is equivalent to ground, the resistor is going to that point.

    In many ways this all applies to ESD control too, there are a lot of similar concepts.
     
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