1. Chapter 7
Section 1

2. ELECTRICITY What would life be like without electricity?
List 4 things that you would miss the most:
           1) ______________________________            2) ______________________________            3) ______________________________            4) ___________________________           

3. Positive and Negative Charge
atoms have protons (positive) and electrons (negative);  neutrons are neutral
when objects have an excess of electrons, they become negatively charged
Opposites attract
Objects with the same charge repel

4. Diagram of an Atom Protons and Neutrons are in the center
Electrons orbit around the outside
      -- these are SUBatomic particles
Bohr model of the atom
Label the protons, neutrons, electrons, and the nucleus
Electricity is the flow of electrons

5. Static electricity occurs when electrons transfer to your clothes or hair and give them a charge.  When you touch something, the charge is released, causing a "jolt"
Each hair is negatively charged and repels other hairs.
Or balloons stick to the cat

6. The force created by this field can either
Electric fields surround every charge and can act upon other objects (even without touching them)
The force created by this field can either 
                      
                         attract          or           repel

7. Conductor - material in which electrons can flow freely
Ex. Metals, such as copper
Insulator - electrons do not move easily through
Ex. plastic, rubber

8. Charging Objects There are two ways to charge an object:
Contact—physically touching or rubbing
Induction—forced charge as the result of nearby object

9. Lightning and Thunder
Lightning is one of the best examples of static electricity. It is actually a huge static discharge. Thunder is the result of the particles of air being heated super hot and pushed out of the way .
Look on page 197 for a detailed view on how lightning is formed.

10. What is Grounding?
Buildings often install lightning rods, which provide a path for electrons to take to the earth, bypassing the building and sensitive electric equipment

11. Section Check How does an object become charged?
What is static electricity?
Why would dry air be better for shocking a door knob than humid air?