GATE 2020 EC – Question 28
In the circuit shown below, all the components are ideal. If $V_i$ is $+2$ V, the current $I_o$ sourced by the op-amp is ________ mA.
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Correct answer: 6
Explanation
This is a non-inverting amplifier with gain $1+\frac{1\text{k}}{1\text{k}}=2$, so $V_o=4$ V, within the $\pm5$ V supplies. The load current is $\frac{4}{1\text{k}}=4$ mA and the feedback network ($1\text{k}+1\text{k}$) draws $\frac{4}{2\text{k}}=2$ mA, so the op-amp sources $6$ mA.