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Elecrtomotive Force

  1. Sep 1, 2008 #1
    was just reading through my physics revision book when i noticed one of the equations for E.M.F
    In class and the exams im sure we used EMF= V-Ir, but the book said that V=EMF-Ir.
    was just wondering which one was right so that i dont make a mistake in the future!!
    any help would be great!
  2. jcsd
  3. Sep 1, 2008 #2
    ignore that one guys, i just thought through it and it is V=EMF-Ir.
    it has to be becuase the EMF is the maximum potential difference between 2 electrodes and the voltage is smaller than the EMF due to internal resistance!
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