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Why is voltage the same in a parallel circuit

  1. Apr 7, 2013 #1
    I am wondering why are voltages the same across a parallel circuit. How can we say that it depends on the start and end points only. On what basis? Thanks for clarifying!
  2. jcsd
  3. Apr 7, 2013 #2


    Staff: Mentor

    By definition. All elements which are in parallel are connected to the same pair of nodes (definition of parallel) and all points on a given node are at the same voltage (definition of node).
  4. Apr 7, 2013 #3


    User Avatar
    Science Advisor

    Consider two resistors in parallel. The ends of the resistors are connected together with a conducting wire. Good conductors cannot support a voltage difference, because if there is any voltage difference, current flows until the voltage is the same.
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