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Homework Help: Op amp

  1. Nov 23, 2014 #1
    1. The problem statement, all variables and given/known data
    The op am in the circuit shown is ideal. Calculate the following.
    a) Ia
    b) Va
    c) Vo
    d) Io

    2. Relevant equations
    I have found three equations one at Vn, Va, and Vo.

    3. The attempt at a solution
    The attempt solution is on the attachment. I currently have three equations with four unknowns. I think I need to find a constraint equation, but not sure where to obtain it from. The constraint equation I have on attachment for Io valid?

    Attached Files:

  2. jcsd
  3. Nov 23, 2014 #2


    User Avatar

    Staff: Mentor

    Use the properties of an ideal op-amp to determine the voltage Vn. That will give you the information you need to determine the current through the 8k resistor and hence ia. Continue with Ohm's Law and Kirchhoff's Laws to determine the rest.
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