Small (ultra-portable) Photovoltaic Demos
Small solar panel and fan (or sometimes a commercially produced solar "spinner").
Halogen light to power the above in-doors (if needed)
NMSEA's very own Micro Solar Cars + Radio Controller:
Click here for more info on these great solar demos
For more info on PV, visit the following NMSEA curriculum pages:
Basic DC electricity
Simple PV Demo