Discussion
For the following OP-amp circuit, R1 = R2 = R3 = RF =1.0 kΩ, the output voltage Vout is :
Answer: A
The output is +1.0V.
The circuit is an inverting summing amplifier. With equal resistors, the output is the negative sum of the inputs:
\[ \begin{aligned} V_{out} &= -R_{F}\left(\frac{V_{1}}{R_{1}} + \frac{V_{2}}{R_{2}} + \frac{V_{3}}{R_{3}}\right) \\ &= -(1.0 - 5.0 + 3.0) = +1.0\ \text{V} \end{aligned} \]
-1.0 V forgets the inversion. The 0.5 V values would follow if \(R_{F}\) were half the input resistors, which it is not.
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