It occurred to me that my original response could have been more helpful. In case someone wants to learn more about basic electronics, there are number of TOYS that can help.
My dad was always buying things like this for my son:
50-in-1 Project Lab (eleep-50) Elenco Electronic Science Kits Non Solder
We would play around with them and you really can learn a lot about basic electronics.
Of course, there is a lot more information in books, but this is a cheap way to learn about wiring, switches, diodes, LED's, etc.