Hands on is the best teacher. One year we built a project board that had all of the componits attached to it that FIRST has given us through the years. Each year we added the new stuff and allowed the students to try to make any item on it work. They could look up information, ask questions or try things on their own. Here is a link to our electrical tipps that has a picture of it.
http://team1322.org/electrical.htm . The back had a marker board on it and casters on the bottom. Our programer liked to test his programs on it also.