Temperature coefficient of resistance

Discussion in 'Homework Help' started by Donnybri, Oct 3, 2009.

  1. Donnybri

    Thread Starter New Member

    Oct 3, 2009
    1
    0
    R2=R1[1+(alpha)(t2-t1)]

    Using the above equation, I need to find the maximum workable temperature (t2) of a circuit which contains a relay coil (whos resistance does not change with temp), and two different metal conductors.

    I have found the resistance of the circuit at 20 degC using the two different temperature coefficients.

    1. How do I fit the two different temperature coefficients into alpha in the equation?

    2. and, as R1 contains two different resistances which will rise with temperature at different rates, how do I split them?

    Any help appreciated.
    Thanks in anticipation.

    edit: Has this got everyone as perplexed as I am?

    edit 2: I'm getting a bit desperate now!!
     
    Last edited: Oct 4, 2009
  2. Ron H

    AAC Fanatic!

    Apr 14, 2005
    7,050
    657
    You need to post a schematic.
     
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