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Two divided by zero (superconductors)

Discussion in 'General Electronics Discussion' started by David Young, Oct 1, 2012.

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  1. David Young

    David Young

    Sep 24, 2012
    As V is I divided by resistance, what current would run through a superconductor connecting a potential drop of 2V?

    The actual voltage is arbitrary, although I was listening to the first track on 'Please' when the question first occurred to me.

    My own guesses about the answer are:
    1) Real-world example: I = 2/whatever resistance there is in the connections to the superconductor.
    2) Hypothetical example: The potential drop would disappear as there would be nothing to maintain the potential difference any more.

    I wouldn't stake my life on 2, but I can't figure out any other way of calculating the current.
  2. BobK


    Jan 5, 2010
    There cannot be a 2V potential drop across a superconductor, it is always 0. As you surmised any current will be limited by the external circuit.

  3. Raven Luni

    Raven Luni

    Oct 15, 2011
    Infinity is the correct answer to a division by 0. So yes - your limits only apply where this is not the case.
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