Free Online Textbook for Electrical engineering!

The other day I was researching some articles for my senior topic when I stumbled upon a diamond in the ruff: a website that offers unlimited access to a series of textbooks on electricity and electronics (AC current, DC, semiconductors, etc.). Aptly named named All About Circuits, this website offers a plethora of other services as well, such as: video lectures, blogs, worksheets, and forums (on a variety of electrical engineering topics for students, hobbyists, and professionals). If you plan to become an electrical engineer, are a professional engineer, or even just a fan of electronics and would like to expand your knowledge, I recommend that you check out this website now!