I think I handled to remove the initial inquiry, yet one of y’ all just recently asked, “How do I learn electronic devices.” As in circuits, making ’em, and also understanding exactly how they function. We chat up our favorites, (a lot of which you can find at your neighborhood RadioShack) from terrific books like Make: Electronics (we reference it all the time on DIYtryin, to no-soldering youngster friendly kits like LittleBits, Snap Circuits, as well as the ever outstanding, RadioShack Electronics Learning Lab Kit
http://www.radioshack.com/make-electronics/6200113.html
http://www.radioshack.com/electronics-learning-lab-kit/2800055.html
http://www.radioshack.com/littlebits
http://revision3.com/diytryin/
http://www.snapcircuits.net/