1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Voltage output of op-amp

  1. Mar 10, 2014 #1


    User Avatar
    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


    User Avatar
    Gold Member

    For an ideal op amp, your analysis is correct
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted