Different post different books, and this is my first time of coming across this type of book B.L. Theraja's Electrical Technology series is a classic among electrical engineers, I believe those that offer electrical engineer in school or as a profession will love this kind of book, I will ask my son to get it for himself or better still he can download it. I believe it will help him have more knowledge about electrical but he has gone for training on electrical engineering.
I wish you good luck dear friend