I've just started learning about op-amps and something confused me in one of my lectures (apologies for the low quality, it's a screenshot):
The output voltage is going into a rotational electro-mechanical converter, acting as a motor.
Why is the voltage amplified constantly? Since one side of the AC voltage source is connected to the negative side of the rotational converter, surely the op-amp wouldn't be amplifying the voltage?
Sorry for the noob question, I might just be misunderstanding how an AC source works.
Thanks in advance :)