У вашего броузера проблема в совместимости с HTML5
This tutorial is by an electronic hobbyist and illustrated with animation to make the concepts simpler. I did not not explain Kirchoff's voltage and current laws which I think need a separate video.
These are important concepts if you want to understand things such as voltage dividers or biasing transistors. I happen to like robotics, circuit building and programming Parallax Propellers.