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## Homework Statement

[Broken]

The OP amp in the circuit is ideal. Calculate V

_{0}if V

_{a}= 2V and V

_{b}= 1V

## Homework Equations

V = IR

KCL, KVL,

voltage division, current division,

Op-Amp Output V = (Gain)(V+ - V-)

(Gain) = -Rf / Rin

Ideal op amp properties:

Input Resistance R

_{I}= ∞

Output Resistance R

_{o}= 0

Gain A = ∞

Difference Amplifier:

V

_{out}=(V

_{2}*R

_{ground}(R

_{f}+ R

_{1}))/(R

_{1}(R

_{ground}+ R

_{2})) - (R

_{f}V

_{1}/R

_{1})

## The Attempt at a Solution

I still need help understanding op amps, basically. I don't think this is really a differential amplifier but for the formula (and nothing given about any R connected to ground) I think it would simply be

V

_{out}= (-100k/20k)*2V = -10V ?

Thank you

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