In a negative feedback configuration using an op-amp, what is the primary effect on the output voltage when the input voltage increases?

When the input voltage rises, the negative‑feedback loop forces the op‑amp output to change in the same direction but with a reduced magnitude, because the feedback reduces the effective gain. The amplifier therefore produces a larger output voltage, but the increase is smaller than the input change would produce without feedback. This keeps the error between the input and the feedback‑sampled voltage small and the circuit stable. For example, in a non‑inverting amplifier with a closed‑loop gain of 10, a 1 V rise at the input will raise the output by about 10 V, not by 1 V. Thus, the primary effect is a proportional but attenuated rise in the output voltage.