A few years ago Gizmodo ran a series of mostly video posts about the inner workings of electronics. The series of four posts featured videos explaining things like resistive sensors, LEDs, diodes, volts, amps, and electrical pressure. You can find the posts in sequence here, here, here, and here. The first video in the series is embedded below.
Electrical Pressure from Sparkle Labs on Vimeo.
Applications for Education
If you teach any courses dealing with electronics, these videos could make a good supplement to your lessons. Some of the topics covered in the Gizmodo series deal with logic and sequencing (in fact the whole series kind of deals with sequencing) which could be worked into a mathematics lesson. Or perhaps you have a young person in your life who just likes to tinker with electronics (I loved to tinker with an electronics board from Radio Shack as kid in the 80's) and these videos could help that young person get a better understanding of electronics.