I started reading control system (book) just a few days ago , In the derivations of equivalent transfer function of Cascade or feedback connections it assumes that
"The subsystem connected to another subsytem doesn't load it"
But in case of passive systems mostly there is loading effect
1.Is that is reason why "only" passive systems are are not that important for designing control systems
- with The use of only passive systems, can we design any feedback system ? Because I cannot visualize how can a passive system acts in a closed loop, is there any example of it?