1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    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!

Potential Difference and flow of current

  1. Jan 27, 2016 #1
    Okay guys
    I am a beginner (in electrostatics as i just started studying it)
    I am thorough with kirchoff's rules/laws
    But one thing which bugs me is this doubt
    So in the book that i am reading
    It says that even if the potential difference is zero,current flows through a wire
    I don't get how
    I mean
    After all isn't ΔV=IR
    so ifΔV is zero and so is R doesn't that mean that I is infinity or indeterminate
    I am guessing the answer's got to do with some sort of assumption/approximation
    But could you guys help me out?
    Help is much appreciated!:)
  2. jcsd
  3. Jan 27, 2016 #2
    Could you give some context? Like what was said before that statement? Or just post a picture of the page please
  4. Jan 27, 2016 #3


    User Avatar
    Homework Helper
    Gold Member

    It's an approximation, yes. Voltage drop across the wire is so small compared to that across the components that it is taken as 0. Wires are assumed to be ideal. In practice, they do have some resistance. Superconductors are an exception, but that's a different topic.
  5. Jan 27, 2016 #4
    i get it
    Those approximations again
    Thanks for clarifying my doubt!!:)
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Similar Discussions: Potential Difference and flow of current
  1. Flow of current (Replies: 3)