7.1 static charge. electric charges that can be collected and held in place if you recall from the...
TRANSCRIPT
CHAPTER 7 NOTES7.1 Static Charge
STATIC CHARGE
Electric charges that can be collected and held in place
If you recall from the chemistry unit, an atom has protons (positive) and neutrons (neutral) in the nucleus and electrons (negative) around the outside If protons equal electrons then the atom is neutral All solid materials are charged by the transfer of
electrons If electrons are lost then the atom or object is positive If electrons are gained then the atom or object is
negative
MORE INFO
Friction between two objects can result in one object losing electrons and the other object gaining electrons Acetate (transparency plastic) rubbed with paper towel
gained electrons from the paper towel to become negative (and conversely, the paper towel is positive)
Materials that do not allow charges to move easily are called electrical insulators Glass, plastics, ceramics and dry
wood Materials that allow electrons to travel freely are
called electrical conductors Metals like copper or aluminum
YET MORE INFO
The unit of electrical charge is called a Coulomb (C) 1 C is the addition or removal of 6.25 x 1018 electrons
Charging an object through friction occurs naturally or artificially In a cloud, the friction between rising hot air and the cloud
produces lightning Van de Graff generator using a moving belt to produce
friction and a negative charge which is collected in the dome
Plastic sandwich wrap Air ionizers take electrons out of the air Paint can be given an electric charge to stick to
vehicles better
FINAL PIECE OF INFO!
Sparks caused by a build up of static charge can blow up fuel trucks so a cables are attached to provide grounding (a way for extra electrons to get absorbed into the ground) Lightning rods and ground wires are
examples