Hello folks, This is my first post here, I hope I am posting my question in the correct place/manner? I am a mechanical engineering student taking an electrical class. We are studying op amps. The thing that is confusing me is current flow in the circuits. I understand that there is infinite input impedance going into the op amp, and zero impedance out. I wonder how current can flow out of the op amp if none flows in? Am I correct in understanding that inside of an amplifier there is some sort of dependent voltage source? If there is no current flowing into the op amp how can the source inside depend on anything? Thanks in advance for any help somebody can give me in understanding op amps, I will appreciate it.