Electricity Inateractive site on conductors, insulators, open/closed circuits, parallel/series circuits, static electricity, & electromagnets
Energy Quest This site is the energy education website of the California Energy Commission.  It includes information, videos, games, resources, and activities on energy and energy conservation.
Light Introduction to types of light 
Pod's Mission Interactive site on electricity
Sounds Amazing Interactive site on sound & waves
Waves 4 lessons on waves from the Physic Classroom