1. PF Contest - Win "Conquering the Physics GRE" book! Click Here to Enter
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

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.
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook