Jeri Ellsworth, who is one of the coolest people putting geeky content on the internet, is a very compentant person.
She's working with Adafruit Industries to produce a series of YouTube videos on basic electronics.
Here's a link to the Playlist for A to Z of Electronics.
So far, the series includes the following videos:
I believe more is coming. You have the playlist link above in case I don't get around to updating the list here.