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Measuring underwater electricity

  1. Sep 21, 2007 #1
    Suppose I connect 2 9v batteries (for example) in series with a fish tank (30mm x 30mm x 20mm) containing water and an ammeter, is the current registered the same as the current in the water? I should think so but I am not sure.

    The copper wires-cum-electrode being positioned at either ends.

    Much thanks
  2. jcsd
  3. Sep 21, 2007 #2


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    Yes, the fish tank would carry the circuit current. The resistance of the tank would be dependent on the contaminates in the water and the geometry of your probe tips.
  4. Sep 24, 2007 #3
    Because the fish tank is in series with the circuit, all the circuit current must travel through the water. So yes, it is the same current.
  5. Sep 29, 2007 #4
    Surely you don't have a 30mm x 30mm x 20mm fish tank. What are you doing?
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