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Homework Help: Resistance from heat system, (Thermo)

  1. Feb 4, 2010 #1
    1. The problem statement, all variables and given/known data
    A thermistor is a solid-state device widely used in a variety of engineering applications. Its primary characteristic is that its electric resistance varies greatly with temperature. Its temperature dependence is given approximately by R = R0e^(B/T), where R is in ohms (Ω), T is in kelvins, and R0 and B are constants that can be determined by measuring R at calibration points such as the ice point and the steam point.

    a.) If R = 7360 Ω at the ice point and 153 Ω at the steam point, find R0 and B.
    R0 = ohms
    B = K

    (b) What is the resistance of the thermistor at T= 98.6°F?

    c) What is the rate of change of the resistance with temperature (dR/dT) at the ice point and the steam point?



    2. Relevant equations
    R = R0e^(B/T)


    3. The attempt at a solution
    for part A I tried to solve it algebraically by Making each equation equal to B and solve for R0.
    But My answers were all wrong (-2.61, 11.28)
     
  2. jcsd
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