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Voltage output of op-amp

  1. Mar 10, 2014 #1

    Maylis

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    Gold Member

    1. The problem statement, all variables and given/known data
    Determine vo across the 10-kΩ resistor in the circuit below.


    2. Relevant equations



    3. The attempt at a solution
    For this problem, using the ideal op-amp model, I believe the currents are zero in both the positive and negative terminals of the op amp. Therefore, there is no voltage drop across neither the 2 kΩ resistor nor the 50 Ω resistor. I know the golden rule that you cannot do KCL at the output of an op-amp, and knowing the voltage at the negative and positive terminals is the same, I conclude that the output voltage is just 5V-1V = 4V. This seems weird, but its what my analysis produces. I am uncertain of my answer though.
     

    Attached Files:

  2. jcsd
  3. Mar 10, 2014 #2

    donpacino

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    Gold Member

    For an ideal op amp, your analysis is correct
     
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