Wednesday, July 16, 2014

electromagnetism - Is current in superconductors infinite? If they have 0 resistance then I (V/R) should be infinite?



I learned many years ago that according to Ohm's law, current is equal to voltage divided by resistance. Now if superconductors have zero resistance then the current should be infinite. Moreover the power should be zero too as $P=I^2R$.


In superconductors, current can pass without applied voltage. Since current is flowing so there is definitely some energy flowing in the wires but VIt=energy and V is zero so there is no energy ?


How to solve this discrepancy?




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