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Help me understand this video

Discussion in 'Electronic Design' started by amdx, Jan 31, 2013.

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  1. amdx

    amdx Guest

    Hi all,
    At 3:35 of this video they move a water drop with an electric charge.
    There are three electrodes, a black one that seems to be in constant
    contact with the water drop through the continuous trace. Then there are
    two red electrodes that I think are at the same potential.

    That is my question, are the two red electrodes connected together?

    This is an outcast in these NerdRage videos, He has 128 videos, so far
    cool, nerdy stuff. I think many will enjoy them.
  2. brent

    brent Guest

    I watched this. I am pretty sure the two red probes are the same
    voltage. I had to really slow down and look at the shapes etched on
    the glass. The black probe connects to one long continuous connection
    and half the drop is always on that geometric shape. Along the long
    rectangle (which the black probe connects to) are lots of little
    squares. Each square floats relative to the other squares and the
    long rectangle.

    When she moves the red probe she is charging an adjacent square and
    ltting the charge off the current square. The water drop then centers
    itself on the newly charged square which causes the movement.
  3. brent

    brent Guest

    Nice to see Canadians let their science students build bombs. Have to
    go to 5:25. Pretty cool.
  4. Sylvia Else

    Sylvia Else Guest

    It seems to me that the drop motion is in two stages. Firstly, when both
    red probes are connected, the drop moves about halfway, then when one
    probe is removed, the drop moves the rest of the way.

    I note that she isn't taking any care to avoid having the probes touch,
    which is consistent with the idea that they're at the same potential anyway.

  5. Exploding fruit and vegatables are always a crowd pleaser. :^)

    George H.
  6. Guest

    Gallagher has made a living from them for decades.
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