# Quick question about op amps

#### de1337ed

Joined Mar 6, 2011
23
I'm referring to the following image:

This is a general op amp, I was wondering what the gain would be if R2 didn't exist, and it was just a feedback loop with r1?
I assume that it's the same as a unity gain buffer right? So Av would just be 1?
Thank you.

#### jimkeith

Joined Oct 26, 2011
540
you are correct--Av = 1

#### crutschow

Joined Mar 14, 2008
27,891
The formula tells you that. Av = 1 + R1/∞ = 1. (Mathematically the limit value of R1/R2 is 0 as the resistance of R2 approaches open circuit/infinity).

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