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Circuit - how much voltage is going through R3?

  1. Aug 16, 2013 #1

    Zondrina

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    1. The problem statement, all variables and given/known data

    A picture of the circuit : http://gyazo.com/54af2ebc610eb36ea345fe7ebdbedefa

    Trying to find ##R_3##.

    2. Relevant equations



    3. The attempt at a solution

    I know the voltage across ##R_1## is ##1.8V##.

    That leaves ##3V - 1.8V = 1.2V## for the rest of the circuit. I know the voltage across ##R_2## is ##1.2V##.

    I know the current flowing through ##R_3## and ##R_4## is ##0.06A##.

    Now my question is how much voltage is going through ##R_3##?

    I know that ##0.06A## of current will flow through ##R_3## so I can use that with the voltage to find ##R_3##.
     
  2. jcsd
  3. Aug 17, 2013 #2

    haruspex

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    How does the voltage across R2 compare with that across R3+R4?
     
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