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Electrostatics. Electrostatics. Definition: The study of electric charges that can be collected and held in one place Non-moving, no flow B. Examples of static charges Clothes in dryer Rubbing feet on carpet Rubbing balloon on head Dry air & hair. Electrostatics.

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electrostatics2
Electrostatics
  • Definition:
  • The study of electric charges that can be collected and held in one place
  • Non-moving, no flow

B. Examples of static charges

  • Clothes in dryer
  • Rubbing feet on carpet
  • Rubbing balloon on head
  • Dry air & hair
electrostatics3
Electrostatics

C. Electric Conditions (States of Matter)

1. Neutral: # of neg. charges = # of pos. charges

2. Negatively Charged: excess of electrons (e- added to atom), more neg. charges

3. Positively Charged: deficiency in e-, they have been stripped away

electrostatics4
Electrostatics

*** Special Note:

The electron is responsible for understanding all electrical phenomena

D. Rules of Charge

1. like charges repel

2. opposite charges attract

3. in electrostatics, charge isn’t created, it’s simply transferred

electrostatics5
Electrostatics

Classes of Matter (electrically speaking)

A. Conductors

1. Picture (on board)

2. Description – a material that readily transfers a charge, e- are free to move around in crystal lattice

***Known as “Sea of Electrons”

3. Examples – metal, water, our bodies, Earth & its atmosphere (best)

electrostatics6
Electrostatics

B. Insulators

1. Description – electrons are tightly bound to nucleus, not free to move

2. Examples – plastic, wood, glass, rubber, paper

C. Semi-conductors

1. electrons can move, but not as free as conductors

2. silicon, germanium

electrostatics7
Electrostatics

How an object can become charged

A. Induction:

1. How is it done? bring a charged object near another uncharged object (but never touch)

2. What occurs? electrons are either attracted or repelled from the side near charged object

3. Diagram – on board

4. Resulting charge – charges separated, but overall charge is still neutral

electrostatics8
Electrostatics

B. Conduction:

1. How is it done? touch charged object to another object

2. What occurs? electric charge (e-) are transferred to object

3. Diagram – on board, 3 steps

4. Resulting Charge – same as charge on rod