In terms of theory, the bible for electronics (and also the book I'd recommend) is The Art Of Electronics. It's big, covers most of the important aspects for sound engineering and is nicely written. It will address all information you need in terms of physics, all electricity and electronics-specific terminology, and much more.
Besides that, I'd second georgi in recommending some simple simulation tool (indispensable for checking your answers in exercises and answering the "and what if" questions).
Then you'll probably want to get some hands on experience. I would suggest starting with one of the many electrical education toys (e.g. this one), which will spare you the necessity to solder things but will allow to perform actual experimentation and learn how to measure signals.
Finally, I would strongly recommend getting an inexpensive oscilloscope early on. It will give you a lot of understanding of what's actually happening. Luckily, sound frequencies are very low from the modern electronics perspective, so a decent device can be found for a very modest price. And it will immediately let you not only measure signals, but also "see" them—very helpful in learning. The last but not the least, it is the only inexpensive way [I know] to quantify noise and distortions.
