Charge
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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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Charge

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Charge

Charge


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


Opposites attract

Opposites 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.


Charge by friction

Charge by Friction


Charge

  • http://phet.colorado.edu/en/simulation/balloons


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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