Static Electricity History of charged particles – 1900’s Electrons(-) in shells Protons(+) in nucleus Neutrons(0) in nucleus
Static Electricity The SI unit for electric charge is the coulomb: C Electrons carry the smallest possible negative charge. The charge on one electron -e is 1.60x10 -19 C Protons carry the smallest possible negative charge. The charge on one proton +e is 1.60x10 -19 C
Static Electricity An object may be charged by rubbing it by another object. Only electrons may be lost or gained by a rubbed object. If the atom loses electrons, it will become____ If the atom gains electrons, it will become ____
Static Electricity Protons are never transferred!!! Charges are never created nor destroyed. = Law of Conservation of Charge
Rubbing to lose/gain e- – Rub a glass rod with silk – the silk gains -e and the glass loses -e – Rub a rubber rod with fur – the fur loses -e and the rod gains -e – They will be oppositely charged and therefore attract each other.
Demos 1. Paper & Golf Tube 2. Golf Tube & 2” x 4” x 8’ 3. Balloon on the Wall
Conduction is just like sharing To charge an object by touching it with another charged object. The second object shares the charge and is always the same charge as the first object. Examples of sharing Charging by Conduction
-100 A) Both 0 B) Both –10 C) Both –5 D) Both +5 IC