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Resistance Temperature Detectors Question

  1. Oct 31, 2007 #1
    1. The problem statement, all variables and given/known data
    An RTD has a (wierd looking a) (20'c) = 0.004'C-1.
    If R = 106 Ohms at 20'c find the resistance at 25'c


    2. Relevant equations

    R=Ro(1 + (wierd looking a)(T-To))

    Answer should come to 108.12 Ohms



    3. The attempt at a solution

    20 / 106 = 0.1886 * 25 X
     
  2. jcsd
  3. Nov 1, 2007 #2

    George Jones

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    What do you think [itex]R_0[/itex] and [itex]T_0[/itex] equal?
     
  4. Nov 1, 2007 #3
    I managed to do it in the end

    Hi,

    I had another go at it and i got the correct answer :smile:

    Sometimes you have to look at things twice.

    I cannot do this one:

    A strain gauge has GF = 2.14 and a nominal resistance of 120 Ohms. Calculate the resistance change resulting from a strain of 144 um/m.
    Any help would be great.
     
  5. Nov 1, 2007 #4

    George Jones

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    Great!

    What is the relevant equation? Once you have this, I think it's just a matter of plugging in the numbers.
     
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