Learning Engineering is a nice website offering dozens of short video lessons about machines, materials, and energy. The site is organized into three primary sections; electrical engineering, mechanical engineering, and civil engineering. Within each category you will find sub-categories and topics for further exploration. Each topic is explained with a video along with a set of diagrams and text explanations. Check out the wind turbine video and diagrams to get a sense of what Learn Engineering is all about.
Applications for Education
The videos on Learn Engineering a bit dry, but they are clear. The combination of the videos with diagrams makes Learn Engineering a good resource for students to use as review materials after a lesson that you have taught.