http://archive.fossweb.com/modules3-6/MagnetismandElectricity/activities/electromagnet.html
http://www.sciencekids.co.nz/gamesactivities/electricitycircuits.html
http://thefusebox.northernpowergrid.com/page/index.cfm
Battery 1: https://www.youtube.com/watch?v=CX84l5ZZHVg
battery 2: http://mocomi.com/how-do-batteries-work/
Try Engineering-games, lessons, searchable= http://tryengineering.org/
Squishy Circuits http://courseweb.stthomas.edu/apthomas/squishycircuits/howTo.htm
Makey Makey https://vimeo.com/60307041