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Charge. Warm Up. What is an electron? Where is located in an atom? What is a proton? Where is it located in an atom?. Atoms. What are the parts in an Atom?. Electrons. E lectrons are present in the region of space outside the nucleus.

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Presentation Transcript
warm up
Warm Up
  • What is an electron? Where is located in an atom?
  • What is a proton? Where is it located in an atom?
atoms
Atoms
  • What are the parts in an Atom?
electrons
Electrons
  • Electrons are present in the region of space outside the nucleus.
  • They are negatively charged and weakly bound to the atom.
  • They are loosey goosey and float from one atom to the next
  • They like to party
protons and neutrons
Protons and Neutrons
  • The nucleus of the atom contains positively charged protons and neutral neutrons. 
  • They are in the center of the atom.
  • The protons and neutrons will remain within the nucleus of the atom. 
  • They like to stay at home and watch Netflix.
  • THEY NEVER LEAVE THEIR HOME
charges at rest
Charges at Rest

Charge

  • there are two kinds of charge, positive and negative
  • positive charge comes from having more protons than electrons
  • negative charge comes from having more electrons than protons
charge interactions
Charge Interactions
  • Opposite charges repel
  • Same charges attract
sames repel
Sames Repel
  • “Why do you look at the speck of sawdust in your brother’s eye and pay no attention to the plank in your own eye?”
electrostatic charging
Electrostatic charging
  • Materials are divided into three categories, depending on how easily they will allow charge (i.e., electrons) to flow along them. These are:
    • conductors
    • insulators
    • semi-conductors
conductors
Conductors
  • the outermost electrons in the atoms are so loosely bound to their atoms that they’re free to travel around. metals, for example
insulators
Insulators
  • In insulators, on the other hand, the electrons are much more tightly bound to the atoms, and are not free to flow, rubber, wood, plastic for example
semi conductors
Semi-Conductors -
  • In between conductor and insulator
  • silicon is a good example
t hree ways that objects can be given a net charge
Three ways that objects can be given a net charge
  • Charging by friction
  • Charging by conduction
  • Charging by induction
friction
Friction
  • this is useful for charging insulators.
  • rub one material with another
  • Electrons transfer from one material to the other.
  • For example, rubbing glass with silk or saran wrap generally leaves the glass with a positive charge; rubbing PVC rod with fur generally gives the rod a negative charge.
conduction
Conduction
  • useful for charging metals and other conductors.
  • If a charged object touches a conductor
  • charging the conductor with the same sign as the charge on the object
induction
Induction
  •  also useful for conductors.
  • a charged object is brought close to the conductor, and does not touch it.
  • If the conductor is connected to ground (ground is basically anything neutral that can give up electrons to, or take electrons from, an object),
  • electrons will either flow on to it or away from it.
  • When the ground connection is removed , the conductor will have a charge opposite in sign to that of the charged object
polarization
Polarization
  • is the process of separating opposite charges within an object
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