1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

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


    User Avatar

    Staff: Mentor

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


    User Avatar
    Staff Emeritus
    Science Advisor
    Gold Member

    With 2 variable resistors there is a possibility of having 0 ohms resistance, this could damage your power source.
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Similar Discussions: Variable Resistors in a Voltage Divider