1. October 9, 2013

2. 1. Define and describe static electricity
2. Define and recognize the presence of a charge
3. Distinguish between conductor’s and
insulator’s
4. Describe how static electricity is different than
current electricity

3.  Movement of charged particles

4. Rule 1: Like charges repel one another
Rule 2: Unlike charges attract one another

5.  Electrons carry negative charges
and protons carry positive
charges
 Electrons can move from atom to
atom
 An atom that has more electrons
is negative
 An atom that has less electrons is
positive

6.  The imbalance of positive and negative
charges
 So how do we move electrons from one
place to another?
 By rubbing them together

7.  The build up of electrons creates a static
charge
 The jumping of electrons from one object
to another creates a static shock

8.  When two objects are attracted the atoms
don’t move, only their charges
 The positive part of one object will be
attracted and move toward the negative
charge of the other object
 The objects have become polarized.

9.  TRIBOELECTRIC SERIES
 your hand
glass
your hair
nylon
wool
fur
silk
paper
cotton
hard rubber
polyester
polyvinylchloride plastic
 Items near the bottom tend to gain
negative charges when rubbed with
something near the top

10.  Clouds become negatively charged relative to
the ground
 Lightning appear as charges are exchanged
between the clouds and the ground

11.  Currents made of flowing electrons, in one
direction

12.  Ampere (A) – the rate of electrical flow
 Coulomb (C) – unit of charge
 Relationship between charge and distance
 1 C of charge (6.25 billion billion) per second
 So a wire that carries 5 A has 5 coulombs of
charge per second

13.  Electrons flow only when there is a difference
in electrical pressure – voltage
 Higher the pressure (V) stronger the flow
 Voltage = potential energy/charge
 Wires need a pump that provides the voltage to
cause flow

14. Simple Circuit

15.  Have loosely held electrons that travel very
easily
 Most metals

16.  Materials that do not allow electrons to travel
freely
 Plastic, cloth, glass and dry air