Learn basic electricity
I'd like to suggest this training book from the US Navy to anyone who needs to learn basic electricity in order to work out some alternatives for themselves. I think this is updated from the one I used which had been originally published in the 1940's. Anyway I see that at the end of the book this source has been updated with some modules on topics that did not yet exist in the 1940s.
If, like me, you prefer working from paper books, there are probably a bazillion of them to be found in used bookstores and probably in public libraries.