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Calculating Operating temperatures

  1. Sep 15, 2009 #1
    1. The problem statement, all variables and given/known data
    I have to calculate the working temperature of a tungsten element, i have the following info:
    (at room temp) Resistance: 4.6 ohms
    current: 0.150A
    Voltage: 6V
    Wire Length: 25mm
    Wire Diameter: 0.025mm
    Temp Coefficient: 0.0044

    3. The attempt at a solution
    I've tried using Joules first law (http://en.wikipedia.org/wiki/Joule_heating Q ~= I^2 * R) but get ridiculous answers like 0.09K and 103k.

    * "~=" means proportional to

    If anyone can give me a simple equation to work this out as well as an example I'd be VERY grateful, thanks in advance.
  2. jcsd
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