Since the op-amp tries to make its two inputs equal and one input (the voltage reference) stays constant, it will adjust its output voltage until 5V appears at the midpoint of the divider.

• 因为运放总是要保持两个输入端的平衡，而其中的一个是保持不变的（参考电压），所以，他会调节自己的输出电压一直到分压电路出现5V为止。