1. Charges Static electricity

2. 1. Electricity describes all phenomena caused by positive and negative charges
Static Electricity
Dynamic Electricity
Transfer of electrons from one object to another
The charges are at rest
Motion of electrons
Charges are in motion

3. 2. Negatively charged bodies contain more electrons (-) than protons (+) Positively charged bodies contain more protons (+) than electrons (-) A neutral object contains the same amount of protons (+) and electrons (-)

4. 3. We can charge objects by… i) Friction ii) Conduction iii) induction

5. The basics Only electrons move from object to object I’m Outta Here
Goodbye !!

6. i) By Friction
One material rips the electrons off another material, after rubbing the two together

7. To Summarize…
2 Neutral Objects Get rubbed together (Friction 1 rips the electrons from the other 1 positive object and 1 negative object

8. Triboelectric series Plastic Gold Copper Wood Cotton Wool Glass
Tendency of
gaining
electrons
Plastic Gold Copper Wood Cotton Wool Glass
(Negative)

9. Triboelectric series Plastic Gold Copper Wood Cotton Wool Glass
Tendency of
gaining
electrons
Plastic Gold Copper Wood Cotton Wool Glass
The one higher up
on the list gains
electrons,
therefore is negative
(Negative)

10. Triboelectric series Plastic Gold Copper Wood Cotton Wool Glass
Tendency of
gaining
electrons
Plastic Gold Copper Wood Cotton Wool Glass
Gold (-) and Wood (-) will repel
Gold (-) and Cotton (+) would attract
Gold (-) and Wool (+) would attract
Wood (-) and Cotton (+) would attract
Wood (-) and Wool (+) would attract
Cotton (+) and Wool (+) would repel
(Negative)

11. ii) By Conduction
One already charged object, « shares » its charge with a neutral object that it has touched

12. iii) By Induction
One already charged object, « splits» the charges of a neutral object without touching

13. To Summarize Friction Conduction Induction Start Action
End Charged objects
Friction
2 neutral objects
Rubbing
Objects have opposite charges
Based on Triboelectric series
Conduction
1 charged object
1 neutral object
Touching
Both objects have the same charge
Induction
Not touching
Charged object still charged
Neutral object has seperated charges

14. 4. Electrical charges of like signs repel, while electrical charges of opposite signs attract

15. Neutral objects always attract (induction)- e- n o + + - p+ - n o + + -

16. To summarize… Objects of similar charge will repel
Objects of opposite charges will attract
A neutral object will always be attracted to a charged object A B B C

17. 5. Conductors:. substance that allows the free
5. Conductors: substance that allows the free flow of electrical charges Insulators: substance hat impedes the free flow of electrical charges

18. Conductors
Metals
Electrolytic solutions
Acids
Bases
Salts e-

19. Insulators
Wood
Air
Rubber
Plastic
Glass
Silk e-