NVQL06 demonstration of Opamp golden rule Va = Vb using Inverting Amplifier, and show the reason behind is high gain of amp.
Adjust the input voltage Vb and observe Va also changing according to it making Va = Vb, only when fb switch is on.
Further, reduce the gain of opamp and observe what happen to voltage differance of Va and Vb amplified by another amp of gain 1000 in the upper right ( reduce the gain of that amp when output reach 5V)
