Single Supply, Multiple Load

Discussion in 'Homework Help' started by Petrucciowns, Jun 17, 2009.

  1. Petrucciowns

    Thread Starter Active Member

    Jun 14, 2009
    62
    0
    I am going through all my old homework and creating notes. (I know I should have taken notes in the past) Can anyone help me understand how the following answers were calculated. I looked under the DC section on All about circuits and didn't find any tutorials.
    Thanks for any help.

    http://img171.imageshack.us/img171/1062/exam33.jpg
     
  2. StayatHomeElectronics

    Well-Known Member

    Sep 25, 2008
    864
    40
    To start you seem to be given Ib = 10 mA. Ib is across R3. You also seem to be given the the voltage across R3 is 100V. So, R3 = 100V / 10 mA. Voltages at each node in the diagram given in the problem, unless I am reading the diagram wrong. Find the voltage across the individual resistors. Add the currents from the different paths into the nodes and, therefore, through the resistors. Then use R = V / i.

    What is the voltage across R2? 150V - 100V = 50V
    What is the current through R2? Ib + I(L3) = 10mA + 20mA = 30 mA
    What is R2?

    Continue with the same method until the problem is solved...
     
  3. Petrucciowns

    Thread Starter Active Member

    Jun 14, 2009
    62
    0
    I really appreciate your time to help me out. I remember now thank you so much.
     
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