Help me /sci/,

I'm studying to become a ship machinist and I'm having trouble with the electricity theory. I tried looking at the sticky but the link to the Serway google document is broken. I'm a brainlet that's just starting with the theory about electromagnetic fields, coils, resistances, condensators etc. Can anyone recommend me a document or something because the sticky doesn't work. My teacher gives me assignments but he doesn't give the answers to the exercises. I'm sorry if I'm bothering /sci/ with this.

To make up for it: this is also a thread to talk about electricity in general, I guess