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Variable Resistors in a Voltage Divider

  1. Sep 23, 2013 #1
    My textbook says that in a voltage divider (voltage source Vin, then a resistor, then another path that leads to Vout, Resistor two, Ground, that it is a bad idea to use variable resistors for BOTH of the resistors (but it is okay if you just do one or the other). Does anybody know why?
     
  2. jcsd
  3. Sep 23, 2013 #2

    berkeman

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    Staff: Mentor

    What happens if both potentiometers are set to zero?
     
  4. Sep 23, 2013 #3

    Integral

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    With 2 variable resistors there is a possibility of having 0 ohms resistance, this could damage your power source.
     
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