ah well, magnetic pickups have a magnetic field, and the steel strings cut through the field and that's converted into the electric signal. So, if the string material isn't magnetic, the magnetic pickups can't 'collect their vibrations'
On the other hand, we have piezo pickups, commonly seen on acoustic guitars (think Fishman) which i'm not too sure how they work exactly, but i think theyre the ones which collect the strings vibrations and turn em into the electric signal. That's why they're all under saddle - the strings gotta be in contact with em, somehow - Unlike the magnetic pickups.
The Amp amplifies the electric signal into sound. The pickup transduces the vibrations into electric signal.
Can anyone explain to me how the guitar's wood body affects the overall tone? Is it because it affects the way the strings vibrate, resulting in a different tone?