18.1
Electric Charge and Static Electricity
Electricity Video
http://www.youtube.com/watch?v=E27XDNf2cxc
Electric Charge
Electric Charge
The property of matter that gives it the ability to attract and
repel other matter.
•  Atoms have positive charges (protons)
•  Atoms have negative charges (electrons)
•  If an atom gains or loses electrons it becomes
electrically charged
Electric Charge
The Atom
Electric Forces
Electric Forces
Electric Force are the attraction and repulsion of electric
charges
Law of Electrostatics
  Like charges repel
  Opposite charges attract
The strength of electric forces depends on the strength of the
electric charges
Electric Fields
Electric Fields
Electric Fields are the space around the charge particle that it
can affect.
  An electric fields strength is dependent on two things:
1.  Strength of the charge
2.  Distance from the charge
Static Electricity
Static Electricity
Static Electricity is the study of the behavior of electric charges,
including how charges are transferred between objects.
  When walking across carpet with socks on your body
collects negative charges
  Touching another object like a doorknob or your friend
causes negative charge (electrons) to “jump” to the
positive object
Static Electricity
Transferring Charges
Three ways to transfer a charge:
1.  Friction
2.  Conduction (Direct Contact)
3.  Induction
Transferring Charges
Friction
Charge transferred by objects rubbing together
Example
Rubbing a balloon on your hair
Transferring Charges
Conduction
Charge transferred by direct contact
Example
A metal rod touching a charged object
Transferring Charges
Induction
Charge transferred from a distance
Example
Charged hand near a doorknob
Transferring Charges
http://www.youtube.com/watch?v=-n1pSHzdahc
18.1 Assessment
Question #1
How is a net electric charge produced?
An excess or shortage of electrons produces a net electrical
charge.
Question #2
What determines whether charges attract or repel?
  Like charges will repel
  Opposite charges will attract
18.1 Assessment
Question #3
Name two factors that affect the strength of an electric field.
1.  Net Charge
2.  Distance from the charge
Question #4
List three methods of charge transfer.
1.  Friction
2.  Conduction (Direct Contact)
3.  Induction
18.1 Assessment
Question #5
What is the Law of Electrostatics?
Like charges repel and opposite charges attract