Ideal op-amp question

Discussion in 'Homework Help' started by boks, Oct 26, 2008.

  1. boks

    Thread Starter Active Member

    Oct 10, 2008
    218
    0
    Could somebody explain to me why V- must equal V+ for an ideal op-amp?
     
  2. mik3

    Senior Member

    Feb 4, 2008
    4,846
    63
    Vout=A*(V1-V2)

    where
    A=differential gain
    V1=voltage on the non-inverting input
    V2=voltage on the inverting input
    Vout=output voltage

    Lets say the output is 10 volts and the gain is infinite

    thus (V1-V2)=10/infinite=0
     
  3. boks

    Thread Starter Active Member

    Oct 10, 2008
    218
    0
    Makes sense. Thanks :)
     
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