Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

R = rho L / A

  1. Mar 12, 2014 #1
  2. jcsd
  3. Mar 12, 2014 #2

    Simon Bridge

    User Avatar
    Science Advisor
    Homework Helper
    Gold Member
    2016 Award

    That sounds right - it only works for a nice geometry.

    consider a rectangular plate LxWxT dimensions (length x width x thickness)
    the resistance between opposite corners won't be ##\rho L/WT##

    Even if I attach the wires to the center of areas WxT, imagine W=T=1000m ... how does the current travel through the resistor then?
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook