Missing resistor parallel circuit

Discussion in 'Homework Help' started by JuggernautJB, Oct 17, 2017.

  1. JuggernautJB

    Thread Starter New Member

    Oct 17, 2017
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    Trying to figure out the missing resistor in a parallel circut

    R1= 20
    R2=?
    Rt= 13.33

    Any help would be great
     
  2. dl324

    AAC Fanatic!

    Mar 30, 2015
    8,259
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    Welcome to AAC!

    In homework help, you need to show your best effort so we can see where you're having difficulty.
     
  3. philba

    Active Member

    Aug 17, 2017
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    Write out the equation for parallel resistance. Then, manipulate the equation to isolate R2.
     
  4. JuggernautJB

    Thread Starter New Member

    Oct 17, 2017
    2
    0
    Thanks. Was trying to figure out the equation
     
  5. philba

    Active Member

    Aug 17, 2017
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    It's just simple algebra. Practice it until you can do it in your sleep.
     
  6. dl324

    AAC Fanatic!

    Mar 30, 2015
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    For calculating the resistance of two resistors in parallel?
     
  7. WBahn

    Moderator

    Mar 31, 2012
    24,077
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    So show your work. Maybe we can help. What is your starting point? If you have known values for R1 and R2, how would you calculate Rt? Start with that formula.

    Also, see if you can place some limits on what the value of R2 can be? What would Rt be if R2 was 20 Ω? Based on that, does R2 need to be more or less than 20 Ω. This will help you catch wrong answers instead of just blindly accepting them.
     
  8. shteii01

    AAC Fanatic!

    Feb 19, 2010
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    It goes something like this:

    u r total r.jpg
     
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