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Static Electricity

Static Electricity. What is electricity? What do you know 
about electricity 
already?. Static electricity is an electric 
charge that can be collected and 
 held in one place . “static” means stationary or not 
moving Is the temporary transfer of 
electrons (e-) . Static Bill Nye 1:54.

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Static Electricity

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Presentation Transcript

  1. Static Electricity What is electricity? What do you know 
about electricity 
already?

  2. Static electricity is an electric 
charge that can be collected and 
held in one place. “static” means stationary or not 
moving Is the temporary transfer of 
electrons (e-). Static Bill Nye 1:54 static and water 2:08

  3. Examples of Static Electricity Forgetting to put a 
bounce sheet in the 
clothes dryer

  4. Thunder and Lightening More on this later......

  5. Rubbing a Balloon on Hair/Wool

  6. Combing Hair

  7. Atoms and Charges Remember that atoms contain: ·        protons (positively charged) ·        electrons (negatively charged) ·        neutrons (no charge) If an atom contains an equal number of positive 
and negative charges, the atom is uncharged or 
neutral.

  8. Movement of Electrons In solid materials the electrons can 
move, so all solid materials are 
charged by the transfer of electrons. The movement, or transfer, of 
electrons from one atom to another 
changes the charge on the atom.

  9. Positively or Negatively Charged? When an atom loses electrons, the atom 
becomes positively charged because the atom 
then has more positive charge than negative 
charge. When an atom gainselectrons, the atom 
becomes negatively charged because the atom 
then has more negative charge than positive 
charge.

  10. When two different types of materials are 
brought into close contact , one may lose 
electrons to the other.

  11. Neutral objects can develop a 
positive charge by loosing e- or 
having them redistributed. Cheerio was once neutral

  12. Balloons and Static simulation

  13. Another Example of Positively or 
Negatively Charged Example: Combing your Hair If the material your comb is made of has a 
stronger attraction for electrons than your hair 
does, yourcomb takes electrons from your hair. Your comb becomes negatively charged (it has 
an excess of electrons) your hair becomes positively charged (it has a 
shortage of electrons).

  14. Friction and Static Charge Friction occurs when objects are rubbed against 
one another. This can result in one object losing 
electrons and the other gaining electrons. Charging an object by using friction occurs 
naturally . Ex. the static charge in the clouds that produce 
lightning is due to friction as hot air rises rapidly in 
cloud banks.

  15. Insulators and Conductors Conductors - material that allows 
charges to pass through it easily. 
Examples: metals Insulators - materials 
which do not allow charges 
to pass through. Examples: 
plastic, wood, rubber

  16. Since static electricity is charge that is 
held very nearly fixed in one place, only insulators can retain a static charge. Conductors allow charge to flow, such 
Ex. when you turn on your Ipod and the 
charges move from the battery through 
the wires to complete a circuit. (More on 
this in Ch 8)

  17. Examples of Static Electricity in Technology plastic sandwich wrap It clings because of static charge. Devices used to decrease air pollution -Devices in chimneys use static charge to remove small 
particles of smoke and dust. -Air ionizers freshen air in your homes in the same way.

  18. Examples of Static Electricity in Technology painting automobiles - The paint is given an electrical charge and 
then sprayed onto the body of the automobile 
where it sticks to the metal. In a photocopier - Light and powdered toner are used to produce an 
image using static electricity.

  19. Some dangers of static electricity Lightening  To protect a building 
from lightning, a lightning 
rod is placed on top of the 
building. If lightning occurs 
near the building, the large 
amount of charge will pass 
through the lightning rod to 
the ground rather than 
onto the building.

  20. Electric Force An electric force is a push or pull 
between charged objects.

  21. Laws of Electric Charges The “laws” of electric charges: 1) like charges repel each other 2) opposite charges attract each other 3) neutral objects are attracted to charged 
objects

  22. Electric Discharge Electric discharge - the removal of an electric 
charge from an object.

  23. Examples of Electric Discharge Objects with electric charges can be discharged 
in a number of ways. For example: When you walk across a rug you gain an 
electric charge. Later, when you touch something 
and feel a shock, you are being discharged. Thunderstorms are examples of large electric 
discharge. John Travoltage

  24. Static- Brain Pop Movie Tim and Moby

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