1. Electric Charge and Static Electricity
Chapter 2 Section 1
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2. *Understand the properties of electric charge
Objectives:
*Understand the properties of electric charge
*Compare forms of electrical energy (static, electric
current, induction, lightning)
Electrons: Negative charge (-)
Protons: Positive charge (+)
**Ben Franklin named these charges
Interaction of Charges…

3. Magnets & Electric Charges are…
Alike
Opposites attract
(N) & (S) (+) & (-)
Likes repel
(N) & (N) (S) & (S)
(+) & (+) (-) & (-)
3. They both have
fields
Different
Magnets have a north &
south pole. They can’t be
apart!
2. Electric charges (+) & (-)
can exist alone!
Electric Force: The attraction or repulsion between
electric charges.
Electric Field: A region around a charged object
where the object’s electric force is exerted on other
charged objects.

4. (+) + (-) = Neutral charge = 0
Positive charges are balanced by negative charges.
The (+) & (-) charges cancel each other out. They
become neutral.
The build-up of charges on an object is called…
STATIC ELECTRICITY
In static electricity, charges build up, but they do not
flow.
*What can keep charges from building up?
INSULATORS
Examples: Dryer sheets, rubber soles on shoes,
and humid air.

5. LAW OF CONSERVATION OF CHARGE:
*Charges are not created or destroyed. Electrons
are only transferred from one location to another.
There are 3 ways to transfer a charge…
Friction: Transfer of electrons by rubbing
Conduction: Transfer of electrons by direct contact
(Touching)
Induction: Movement of electrons to one part of
an object by the electric field of another object.

6. Electroscope: Special instrument for detecting an
electric charge. (Electric charges ARE invisible.)
When a negatively charged object and a positively
charged object are brought together, electrons
transfer until both objects have the same charge.
Static Discharge: The loss of static electricity as
electric charges move off an object.
Examples of Static Discharge:
*Lightning *Shock from touching a door knob