If you want to learn something about the way electric works in your home, you can always take electronics class. There you will learn how basic systems work and perhaps be able to start fixing a few things on your own.
You also can find useful handbooks or electronics manuals at the bookstore or library.
If you have questions, you could call an expert or a hardware store sales associate. A home supply store also may have information available on electronic systems, and some stores offer occasional workshops or seminars on topics related to this field.