1. Not finding help here? Sign up for a free 30min 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!

Temperature Coefficient of Resistivity

  1. Apr 30, 2007 #1
    A coil of wire has a resistance of 37.800 Ω at 27.800 °C and 44.400 Ω at 56.000 °C. What is the temperature coefficient of resistivity? Do not enter units.

    Equation: R=R0[1+α(T-T0)]

    then i plugged in number to make the equation look like this:


    and i solve for X and i get X=.0402 and its wrong...

    anyone see something i dont?
  2. jcsd
  3. Apr 30, 2007 #2


    User Avatar
    Homework Helper

    Can you show more of your steps to your final answer? You're making a mistake somewhere.
  4. Apr 30, 2007 #3






    those are the steps i used...im not too sure about what to do with the 1+X part but that might be where im going wrong.
    Last edited: Apr 30, 2007
  5. Apr 30, 2007 #4


    User Avatar
    Homework Helper

    You can't add the 1 to the 28.2, since the units are not the same (it doesn't make sense to do that). You must go

    (44.4/37.8) - 1 = 28.2X

    in the next step to isolate X.
  6. Apr 30, 2007 #5
    ah! yeah now that you say it that doesnt make sense.. thank you very much!
  7. Apr 30, 2007 #6


    User Avatar
    Homework Helper

    You're welcome. :smile:
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?