1. Think about how your life would be different without electricity.

2. School House Rocks Video
Think about connections to daily life and questions you have about electricity..
School House Rocks Video

3. Electricity e-e-e-e-e-e-e-e-e-e-e-e-e-e-e-e-e-e-e-
Movement of electrons
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4. Current Electricity – moving electrons
Static Electricity – electrons waiting to be moved

5. What part of the atom is removable?
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6. What part of the atom is removable?
Electrons can move from one atom to another
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7. Atoms become charged by gaining or losing ...
Electrons
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8. Electrons move from atom to atom
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9. Electric charges can be transferred by three ways

10. 3 ways to transfer electric charge
Conduction
Induction
Friction
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11. Conduction Excess electrons pass to a neutral object when touched
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12. Induction Electrons transferred when a neutral object is near a charged object (in the electric field)
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13. Friction moving electrons by force
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14. LAW OF ELECTRIC CHARGES-- + -- +
Like charges REPEL + --
Opposite charges ATTRACT
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15. Objectives for the Day
Explain the three ways electrons can be transferred using observation.
Identify the type of electron transfer in given scenario.
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16. Static Electricity

17. What Is Static Electricity?
A stationary electrical charge that is built up on the surface of a material
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18. Where do charges come from?
Matter is made up of atoms. + –
Proton (positive charge) +
neutron (neutral)
electron (negative charge) –
atom
nucleus
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19. Where do charges come from?
If electrons = protons neutral
If electrons > protons  negative charge
(gains electrons)
If electrons < protons  positive charge
(loses electrons)
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20. Gain Electrons Lose electrons
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21. Where do charges come from?
Rubbing materials does NOT create electric charges. It just transfers electrons from one material to the other.
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22. Where do charges come from?
When a balloon rubs a piece of wool...
electrons are pulled from the wool to the balloon. + – –
The balloon has more electrons than usual.
wool
The balloon: – charged,
The wool: +charged
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23. Insulators
Insulators: materials that do NOT allow electrons to flow through them easily.
Insulators can be easily charged by friction as the extra electrons gained CANNOT easily escape.
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24. Conductors
Conductors: materials that allow electrons to flow through them easily.
Conductors CANNOT be easily charged by friction as the extra electrons gained can easily escape.
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25. Conductors and Insulators
Copper
Rubber
Aluminum
Cloth
Humans
Hair
Water
Plastic
Most metals
Glass
Paper
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26. Electro-negativity + + + + + + + + + + + + electro-negativity + +
- -
- - -
Glass
Human Hair
Nylon
Silk
Fur
Aluminum
Paper
Cotton
Copper
Rubber
PVC
Teflon
Relative
electro-negativity
ranking for some
common materials
from electron donating
materials (+, glass) to
electron accepting
materials (-, teflon)
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28. Static Electricity Balloon Simulation
Describe how charged particles interact.
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29. Static Electricty Rotating Lab stations
You will have 8 minutes at each lab station Perform the experiment and write down your observations in the data table Be PATIENT. Take your time trying to charge your balloon or comb. If it doesn’t work the first time, keep trying. You will be turning in your detailed observations and an analysis of your observations.
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30. Analysis of Data Activity Type of Electron Transfer
Support for the answer
Example:
Plasma Ball
Induction
Light bulb lit up without touching the plasma ball
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31. Induction: The charge is created by an electric field
When a negatively charged rod is put near a metal can...
electrons of the can are pushed away from the rod. -
 top of the can: positive
attraction +
bottom of the can: negative -
metal can
repulsion
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32. A balloon has a negative charge when rubbed by a woollen cloth.
1 If the balloon can attract some paper scraps, which of the following cannot be the charge of paper scraps?
A Neutral B Positive
C Negative
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33. A balloon has a negative charge when rubbed by woollen cloth.
2 During rubbing, what have been transferred between the woollen cloth and the balloon?
A Electrons B Protons
C Neutrons
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34. Grounding Using a conductor to move an electric charge to the ground.
What is grounding?
An object is grounded when it is connected to the earth.
Using a conductor to move an electric charge to the ground.
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35. Grounding How does grounding occur?
When we touch a metal sphere of positive charge... + +
electrons flow from the earth to the metal to neutralize the metal. + + + –
Metal becomes neutral.
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36. Grounding How does grounding occur?
Similarly, if the metal is of negative charge... – –
extra electrons flow from the metal to the earth and the metal becomes neutral. – – – –
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37. Discharge
Static
Electric
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38. The release of built up electrons
Electric Discharge
The release of built up electrons
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39. How do these relate to static electricity?
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40. How do these relate to static electricity?
Nylon is an insulator and
electric charges build up on it.
The charges built up so much
the people became charged.
Their hair is negatively charged
and repels every other hair
Wool is an insulator and electric charges build up on it. Those negative charges want to get to the ground so they jump to any neutral object. This movement is electric discharge and gives the lamb a shock each time electrons jump from him to a neutral object.
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44. Van de Graff explained Let’s hear from the expert… Static Electricity
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