1. Static Electricity and Charging Objects

2. Learning Goals To be able to explain static electricity
To be able to explain how to charge objects

3. Static Electricity
An imbalance of electric charge at rest on the surface of an object
“Static” means not moving
The charge builds up in one place on the object until allowed to suddenly move to another object

4. Electric Discharge
The sudden movement of static charge between two objects
Rubbing feet on carpet and touching a doorknob, you feel a shock and may see a small spark
Example: lightning

5. Uses of Static Electricity
Static-cling film: static-vinyl film stick on windows using static
Photocopier:
The pattern is made negatively
Toner is positively charged, attracted to the pattern
Toner is then transferred to the paper

6. Charging by Friction
Two neutral objects of different materials are rubbed together, electrons transfer from one to the other
The object that gains electrons becomes negatively charged
The object that loses electrons becomes positively charged

7. The Electrostatic Series
Used to predict the charge produced on each substance
Examples: Determine the charge on each object after they are rubbed together.
Acetate ____________ Fur ____________
Cotton ____________ Rubber ____________ + -- + --

8. Charging by Friction
The two neutral objects now have two opposite charges

9. Charging by Contact
Charging a neutral object by direct contact with another charged object
Electrons move from one object to the other
The neutral object becomes charged with the same type of charge as the object that touched it

10. Conduction between two charged objects
Contact causes electrons to be transferred between the objects until the charge is balanced

11. Charging by Conduction
The two objects now have the same charge

12. Success Criteria I CAN describe static electricity
I CAN explain charging by friction and by contact