Operational amplifier as Voltage follower.... KCL is not met?

Discussion in 'General Electronics Chat' started by omar-rodriguez, Feb 17, 2016.

  1. omar-rodriguez

    Thread Starter Member

    Jun 24, 2015
    51
    2
    Hello, I'm really confused doing the KCL in this circuit

    [​IMG]

    The OPAMP is ideal so... I write the currents as follow (the current over the source is the same over the capacitor, they're in series)

    [​IMG]

    but someone told me that this was wrong, that the right way is as follows:

    [​IMG]

    This makes me think that in this case does not matter that components are in series, the current is not the same....this makes no sense
     
    Last edited: Feb 17, 2016
  2. WBahn

    Moderator

    Mar 31, 2012
    17,715
    4,788
    The components ARE NOT in series. You are forgetting the power supply connections for the op-amp. The positive op-amp supply is what is providing the output current. That current then returns to the positive supply via the ground (circuit common).
     
    omar-rodriguez likes this.
  3. omar-rodriguez

    Thread Starter Member

    Jun 24, 2015
    51
    2
    mmmm .... now I get it .... thanks WBahn
     
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