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Engineering 101 - How to find voltage?

  1. Oct 29, 2009 #1
    1. The problem statement, all variables and given/known data

    niH5T.jpg

    The part that I am having problems with is part A, which asks for Is and Vl. I plain and simply can not figure it out. The teach provides answers to check our work, and she said Vl = 11.90 volts. But I don't see how that is the case. I also have no idea how to find Is :(

    2. Relevant equations

    I don't know :(

    3. The attempt at a solution

    I tried using equations to find the change in voltage over a resistor and then use that to find the voltage...Just plain didn't work :(
     
  2. jcsd
  3. Oct 29, 2009 #2
    Are you familiar with Kirchhoff's Laws?
     
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