Go to Basic Electronics Tutorials. The tutorials are listed in alphabetical order, but if you are new to electronics, I would recommend to start with DC Theory.
Wayne Storr has created a very good set of tutorials, ranging from DC- and AC-Theory over the basic devices Resistor, Capacitor, Inductor and Diode to Transistors and Operational Amplifiers and to circuits like Amplifiers, Oscillators and Waveform Generators and Filters. Digital topics are also covered, ranging from the Binary System, Boolean Algebra, Logic Gates to Combination Logic, Sequential Logic and Counters.
Each tutorial consists of about 5 to 15 consecutive pages which should be read one after another. The tutorials are independent of each other, but if you are new to electronics you might find it useful to look at them in the order in which I have listed them in the last paragraph. On the homepage the tutorials are listed in alphabetical order, but going through them in that order does not make much sense.
The tutorials do not assume prior electronics knowledge of the reader. For a few pages of the tutorial, the knowledge of a bit of mathematics would be useful, for example in the DC-Theory tutorial the advanced methods of circuit analysis require linear algebra. But even without this you can understand most of the tutorial. The AC-Theory tutorial contains a good explanation of the necessary trigonometry, and also of complex numbers (for a more in-depth treatment of this topic, please take a look at the resources on my Complex Numbers page).
If you work through the tutorials you will quickly gain a good basic knowledge of electronics. But if the pace of the tutorials is too fast for you, try Lessons In Electric Circuits (allaboutcircuits) by Kuphaldt - it will take more time to work through them, but they might be easier for the absolute beginner. By the way, the allaboutcircuits forum that is associated with Kuphaldt’s book, is a very good place to ask if you have questions about any topic in the tutorials.
Storr is also writing a Blog that contains some additional topics, some of them a bit more advanced than those that are covered in the tutorials. In some posts he explains questions that readers have emailed to him. It is probably best to look first at the tutorials and then at the blog, if you are hungry for more information.
Wise Warthog Site Overview:
General: Forums, Tips on how to seek Advice
Practical Electronics: Books and Other General Resources, Troubleshooting, Introductions to Oscilloscopes, Breadboarding and Prototyping
Foundations: Basic Linear Circuit Analysis, Analysis and Design of Electronic Circuits, Introductions to Analog IC Design, Circuit Simulation with SPICE
Devices: General Op Amp Resources, Op Amp Applications, Resistors, Capacitors, Diodes, Bipolar Junction Transistors
Application Notes: Analog Devices Seminar Notes, Columns and App Notes by Bob Pease, App Notes by Jim Williams, E-books and App Notes from Texas Instruments
Mathematics: Complex Numbers, Calculus, Mathematics for Physics and Engineering
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