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.
http://www.physics.uoguelph.ca/tutorials/ohm/index.html
Step-by-step procedures help you solve it
http://www.e-insite.net/ednmag/archives/1994/030394/05df3.htm
Tutorials on basic electronics, circuit theory, components and design ideas.
http://ourworld.cs.com/gknott5413/index1.htm
http://www.anatekcorp.com/ttg/tiptrick.htm#Repair worn carbon rubber contacts
http://www.uoguelph.ca/~antoon/circ/tuptun.htm
Finitudes Resistor color code, symbols, different examples.
http://www.williamson-labs.com/resistors.htm
http://www.musicfromouterspace.com/analogsynth/whatyouneed.html
Although it is somewhat specific in some areas
http://www.sound.au.com/an-1000.pdf