DC Circuits Tutorial from Department of Physics, University of Guelph. This site has been selected as a valuble internet resource for Discovery Channel School's Physics in Motion Program for spring 1998.
Step-by-step procedures help you solve it
Tutorials on basic electronics, circuit theory, components and design ideas.
http://www.anatekcorp.com/ttg/tiptrick.htm#Repair worn carbon rubber contacts
Finitudes Resistor color code, symbols, different examples.
Although it is somewhat specific in some areas