Ac current flow

Discussion in 'General Electronics Chat' started by aamirali, Feb 12, 2012.

  1. aamirali

    Thread Starter Member

    Feb 2, 2012
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    I have connected a leg of bulb with ac voltage source & connected other leg to wall of my room which might be from earth. Bulb glows.
    Now my question is ac current flow in one direction during +ve half & during -ve half in reverse direction or more specifically electron flow in opposite direction. (attached is page.pdf)

    So when conventional current flows during +ve cycle that means electron flows in opposite direction i.e from earth to voltage source.
    How can this happen, electron comes via earth
     
  2. crutschow

    Expert

    Mar 14, 2008
    13,052
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    Earth is just the common return line (all earth connections are connected together) for the AC current. So the electrons flow out of the generator to ground and the back out of the ground to the load. Nothing is created or destroyed.
     
  3. MrChips

    Moderator

    Oct 2, 2009
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    Electrons can travel in either direction.
     
  4. aamirali

    Thread Starter Member

    Feb 2, 2012
    415
    1
    How can electrons flow out of earth.
    I haven't connected other leg to neutral. If bulb is connected b/w line & neutral. It can be understood.

    But earth is something different. Yes it is considered a zero potential. But how can electron flow out of earth.
     
  5. t_n_k

    AAC Fanatic!

    Mar 6, 2009
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    In the interests of ensuring your ongoing safety what AC voltage level are you doing this with?
     
  6. aamirali

    Thread Starter Member

    Feb 2, 2012
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    220V ac connected to bulb
     
  7. mcgyvr

    AAC Fanatic!

    Oct 15, 2009
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    The neutral is bonded to ground at the service/distribution box.
     
  8. t_n_k

    AAC Fanatic!

    Mar 6, 2009
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    I'm surprised that no-one (myself included) cautioned the OP concerning the risk involved in their experiment with the light globe and 220Vac.

    Presumably some caution was exercised by the OP, but the prospect of someone with a wire in hand connected through a light globe to active 220Vac wandering over to a "wall" and testing continuity to the building frame somewhat bemuses me.
     
  9. Mark_T

    Member

    Feb 7, 2012
    47
    8
    Electrons are in all things, even your wall. There can be capacitive effects also to complete the circuit.
     
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