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Homework Help: Resistance temperature

  1. Feb 27, 2010 #1
    1. The problem statement, all variables and given/known data
    The resistance of a copper wire is 0.8 ohms at 20 degrees Celsius. When it is placed in an oven, its resistance is 1.2 ohms. What is the temperature of the oven?


    2. Relevant equations
    resistivity = resistivity (initial) [1+ (temperature coefficient of resistivity)X (Tf-Ti)]


    3. The attempt at a solution
    I don't even know where to start..like I have the two resistance but then I don't know what to do with them...I can't plug them into the other formulas for resistivity because I don't have the length and area to find the resistivity for the different resistance values...
     
  2. jcsd
  3. Feb 27, 2010 #2

    rl.bhat

    User Avatar
    Homework Helper

    The relevant formula is true for resistance also.
    R = Ro[1 + α(Tf - Ti)]
     
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