I’m sure some of you have seen this site before, but for those who don’t, this site contains a wealth of information on the following topics:

Site: http://www.allaboutcircuits.com/

[ulist]

Volume I - DC : Basic Concepts of Electricity, OHM’s Law, Electrical Safety, Scientific Notation…

Volume II - AC : Basic AC Theory, Complex Numbers, Reactance and Impedance, Resonance…

Volume III - Semiconductors : Amplifiers and Active Devices, Solid-State Device Theory, Diodes and Rectifiers…

Volume IV - Digital : Numeration Systems, Binary Arithmetic, Logic Gates, Switches…

Volume V - Reference : Conversion Factors, Resistor Color Codes, Math References, Periodic Table…

Volume VI - Experiments : Test Equipment, DC Circuits, AC Circuits, Discrete Semiconductor Circuits…[/ulist]

May I suggest to make this pinned to the top?