1. Static Electricity
How do electrons interact with each other and with objects around them?

2. Static Electricity
Electric Charge = a form of charge, either positive or negative, that exerts an electric force
Three Different Charges:
Positive = (+) has more protons than electrons
Negative = (-) has more electrons than protons
Neutral = equal # of protons (+) and electrons (-)

3. Static Electricity
Objects can become charged when electrons are transferred to or from another object
By contact
Protons do not move…why?
When objects have a charge their electrical make up is imbalanced
We call this Static Electricity = an imbalance of electric charge on the surface of an object

4. + + + - - - + + - What is the Charge?
What charge does this object have?
Charge imbalance should always be understood in relative terms
2 neutral objects will neither attract nor rebel each other
BUT, if a negatively charged object is brought near a neutral object, the neutral object is now more positive relative to the negative object
Therefore they attract

5. Problem Object A and Object B are both positively charged
Object A is much less positive than Object B
Therefore will these objects attract or repel one another?

6. How to Detect Static Electricity
Electroscope = an instrument used to detect the presence of electric charges
Example = Pith Ball Electroscope
An object is brought near to the neutral pith ball
If the object is charged = pith is attracted to the object

7. Law of Electric Charges
A charged object has an electric force
Electric force = the force exerted by
an object with an electric charge creating
an:
attractive or repulsive force
Alike charges rebel
Unlike charges attract
Electrical Field = the affected space around a charged object
The strength of the electric force is related to
the amount of charge on each object
the distance between the charged objects

8. Scenario Lightning is an example of static electricity
Lightning is a result of very strong negative and positive charges attracting
Do you think it is safe to be in a car during a lightening strike? Why or Why not?
It is safe
Because, electrostatic charges tend to remain on the surface of objects and are evenly spread out around the object
Therefore, the lightning will strike the surface of the car but not effect the people inside the car
**all car windows must be shut

9. Induction
When 2 neutral objects are brought close they will neither attract or repel
When a charged object is brought near a neutral object it induces the electrons in the neutral object to move
This is called Induction Charge Separation
A shift in the position of electrons in a neutral object that occurs when a charged object is brought near it
*Does not gain or lose electrons!

10. Application
Electrostatics is a branch of science that deals with static charges and static electricity
Scientists and engineers study electrostatics in school as they will use it everyday in their field
Electrostatic Paint Sprayers
Read Text page 470
Use the Ipad to complete the
“Research This: Powder Coating” at
the bottom of pg. 470

11. Take-home Assignment
In your own words, define static electricity