ATR 72-600 vs B737NG: Main Electrical System Components and Documentation Sources

Hello, I'm an eletrical engineer student curently in my fourth year. For my internship I'm supposed to study and compare the electrical systems of the ATR 72-600 and the B737NG. This is new to me and I'm not familiar with aeronautics. I would be very grateful if you could help me by defining what are the components of  the electrical system in planes in general (also the ATR 72-600 and the boing 737 if possible) and if you have any documentation that could help me that would be amazing !

Thank you in advance.

I found this "reference("")":https://www.theairlinepilots.com/forumarchive/atr/atr-systems.pdf on ATR systems that might help you in your study. For the BOEING system, I'm not sure if these would help:
* "BOEING 737 SYSTEMS REVIEW("")":http://b737ng.flightsimulators.eu/uploads/documentation/smartcockpit/instructors_corner/B737-Electrical_Systems_Summary.pdf
* "B737 NG Ground School("")":https://www.slideshare.net/theoryce/b737ng-electrical-power
* "737 Electrical Video("")":https://www.youtube.com/watch?v=n7lB_QryM74

Thank you so much Kevin !