Discussion
What is the purpose of inverting (-) and non-inverting (+) input terminals on an operational amplifier ?
Answer: D
The two inputs provide input signals for differential amplification.
An op-amp is a differential amplifier: its output is \(A(V_{+} - V_{-})\), the open-loop gain times the difference between the voltages at the non-inverting (+) and inverting (-) inputs. A signal at the + input appears at the output in phase, a signal at the - input appears inverted, and a signal common to both is rejected.
The power supply is connected to separate supply pins, not the inputs. The gain and the amount of feedback are set by the external components connected around the op-amp, typically from the output to the inverting input, not by the existence of the two terminals.
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