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Homework Help: Potentiometer Resistance

  1. Sep 23, 2007 #1
    1. The problem statement, all variables and given/known data
    In the circuit below, the wiper divides the potentiometer resistance between [tex]\alpha R[/tex] and[tex]\ (1- alpha R)[/tex], 0 [tex]\leq[/tex][tex]\alpha[/tex] [tex]\geq 1[/tex]. Find Vo / Vs


    2. Relevant equations


    3. The attempt at a solution

    Im thinking that the Pot. Resistance will be R +(1-[tex]\alpha[/tex])R. Then to find the voltage (R +(1-[tex]\alpha[/tex])R)I

    Attached Files:

  2. jcsd
  3. Sep 23, 2007 #2


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    Homework Helper

    You can ignore the resistance of the main part of the pot to ground that is below the wiper because it is in parallel with a short circuit.
    The resitance of the pot is simply, R - alphaR = R(1-alpha)
  4. Sep 24, 2007 #3
    So would the answer be:


    Sorry about the formatting, I need to learn how to use the system.


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