Potentiometer Voltage

Discussion in 'Homework Help' started by IamConfused, Dec 7, 2010.

  1. IamConfused

    Thread Starter New Member

    Oct 4, 2010
    3
    0
    I am trying to calculate the voltage at the wiper of the potentiometer (where the multimeter is hooked up to). Its probably really simple, but I can't find much on it and getting frustrated.
     
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  2. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
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    The series string with the pot is pretty simple. The other string that attaches in parallel at the one point makes it a bit more fun.

    You could probably solve for the pot in one extreme, and then in the other. The voltage variation might turn out to be linear.
     
  3. Jony130

    AAC Fanatic!

    Feb 17, 2009
    3,957
    1,097
    Vout = 15V / [ R3 || ( R1 + (1-a)R6 )] / [ (R4+R5)||(R2+ a*R6) ]

    a = 0 for 0%
    a = 0.5 for 50%
    a = 1 for 100%

    "||" = (R1*R2) / ( R1+R2)


    [​IMG]
     
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    Last edited: Dec 7, 2010
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