Here is a web site that has all of the US Navy's Electricity & Electronics training modules (Navy Electricity and
Electronics Training Series or NEETS) as PDF files. Interesting & lots of practical information from the basics to advanced electronics, digital computers, microwaves & radar. I remember learning basic electricty and electronics from earlier versions of a few of these manuals back in the 1960's, in Jr. high & high school.
Most of the material is from the late 1990's, with minor 2003 revisions.
Click here: http://www.cbtricks.com/miscellaneous/tech_publications/neets/index.htm