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Is a negative rail really NEGATIVE?

Discussion in 'Electronic Design' started by Paul Kendall, Jun 8, 2011.

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  1. Paul Kendall

    Paul Kendall Guest

    I was once taught that NEGATIVE is electron surplus not simply
    relative potential, or a "positive" zone of electron depletion.

    For example, electrons direct from a battery plate, as opposed to a
    positive 24VDC power supply divided into "+ and -" rails by inserting
    an earth reference midway, through the use of zeners.

    IOW there was no real negative charge there before, so you only have a
    positive charge divided into smaller segments.

    Apart from whether not not it makes any difference in practice, does
    anyone else see the distinction here?

    Paul Kendall
  2. Les Cargill

    Les Cargill Guest

    if Ben Franklin had guessed the other way, there wouldn't be a problem.
  3. Rich Grise

    Rich Grise Guest

    The only time it really makes a difference is when you rub a balloon in
    your hair and stick it to the wall. ;-)

    For anything else, just invert all of the signs. The arrows on diodes
    point in the direction of hole flow.

    The thing I still don't understand is how the crt screen knows exactly
    which hole to throw out of the phosphor, on a trajectory that exactly
    matches the electric and/or magnetic fields through the deflection
    plates/coils/ion trap, to land exactly on the tip of the field
    emission cathode. ;-)

  4. Rich Grise

    Rich Grise Guest

    It'd be a _terrible_ problem! Then the charge carriers would be positrons,
    and we'd all be made of antimatter! =:-O

  5. tm

    tm Guest

    Like the diode, they just follow the arrows.:)
  6. good one. And "in mid-air" too! :)
  7. Which way does Lightning ALWAYS travel?

    And yes, it IS always the same way.

    If the air gets too 'negative' the ground will suck it away eventually!
  8. I find that a very funny remark.

    It would make a great test for up-n-comers at a bar.
  9. Damnit, Jim! I'm a surgeon, not a aaaaaaaaaaaa..........
  10. Warren

    Warren Guest

    Les Cargill expounded in
    And he had a 50% chance of getting it right!!

    I suppose he came out ok on the lightning experiment.


  11. The ground is the attractor. The cloud carries the excess ions
    (electrons grabbed mostly from the air molecules). It ALWAYS goes from
    cloud, to ground when a bolt dumps the cloud's load.

    The ONLY other is from cloud to cloud, as in "heat lightning".

    But all cloud to Earth strokes are downward flows, regardless of how
    the leader and plasma propagation might make some of them appear.
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