Day 1: Static Electricity

1
Day 1 Static Electricity
2
Electricity exists in nature and comes from the
electrons in atoms

-

-
Positive charges
Negative charges
-
-


-

-

Most objects tend to be
Neutral
3
Net Charge of Objects
Neutral Object
Charged Object
-8 8
-6 10
Net Charge
Net Charge
0
4
4
Opposite charges Attract
The Law of Electric Charges states
AND

-
Like Charges Repel
5
Static Electricity the buildup of electrical
charges
(static not moving)

• Total number of protons and electrons in an
  object are not equal because electrons have moved
  (charged atoms)

Only the electrons can move!!


6
Static electricity can discharge after the
charges have had a chance to buildup.
For example
When you shock yourself on a doorknob, this is a
small discharge
Lightening is a MASSIVE discharge of static
electricity
ZAP!!!
http//phet.colorado.edu/new/simulations/sims.php?
simJohn_Travoltage0






7
Ex. - How do balloons stick to walls?
http//phet.colorado.edu/new/simulations/sims.php?
simBalloons_and_Static_Electricity
1. Rub a balloon on a sweater to charge it up.
2. Negative charges in the wall repel from the
balloon.
3. The balloon sticks because the positive
charges left over are attracted to the balloon.
8
Ask yourself

• Why do clothes stick together when you take them
  out of the dryer?

9
Charge
Discharge!!!