New air compressor technician that know nothing about electricity...

I recently started working as an air compressor technician that was hired with no experience so I could be trained from the ground up. Mechanically, I can turn a wrench and I do most of my own car's preventative maintenance. I enjoy the job but I know literally nothing about electricity. While I do have some classes through the company coming up, it's there a good book I should get to at least become familiar with the basics to supplement my on the job training? I mean starting from absolutely no understanding of electricity. Any suggestions would be great.