Radio
https://www.youtube.com/watch?v=4E6uwEiOGsQ

Solar charger
https://www.youtube.com/watch?v=-ag7ttwWCDE

LED light bulb
https://www.youtube.com/watch?v=TZYMc_IzBqk

Potato Battery
https://www.youtube.com/watch?v=AK1Kg_j2oCo

Speaker
https://www.youtube.com/watch?v=ibd4OqWL3zE

Antenna
https://www.youtube.com/watch?v=KVvO6021VIc