Transcript electricityintro

Warm up 12.01.08
Take an Anchor
Question from the
gray tray and glue it
in your notebook.
You will need a new
sheet for the Cnotes.
Goals for today:
Announcements
Electricity Intro:
Charges
Anchor Questions
Reflection
Topic: Electrical Charges
Electrical Charge is a property of
matter.
Examples of properties of matter:
Water- boiling point, freezing
point, density
Topic: Electrical Charges
Electrical Charge is a property
that allows an object to exert
force on another object without
touching it.
Topic: Electrical Charges
Electrical Charge is related to
atoms and their particles:
Electrons are negative
Protons are positive
Topic: Electrical Fields
Electrical Field is the space around
which an object can exert a force:
•The force is stronger nearer the object.
•The force is stronger is the charge is
large.
Topic: Electrical Fields
Electrical Field is the space around
which an object can exert a force:
•The force is stronger nearer the object.
•The force is stronger is the charge is
large.
Topic: Electrical Fields
Electrical Field is the space around
which an object can exert a force:
•The force is stronger nearer the object.
•The force is stronger is the charge is
large.
Topic: Electrical Fields
Electrical Field is the space around
which an object can exert a force:
•The force is stronger nearer the object.
•The force is stronger is the charge is
large.
Brain Break 1
Ask the person next to you:
What was the favorite dish
you had during the break?
Topic: Static Charge
Static Charge is the buildup of
electric charge in an object caused
by the presence of many particles
with the same charge
•Example:
•Balloon and hair
•Balloon and paper
Topic: Static Charge
Opposites attract. And likes
repel.
Topic: Static Charge
Charging objects can be
done two ways:
1. Charging by contact
2. Charging by induction
Topic: Static Charge
Charging objects can be
done two ways:
1. Charging by contactcharges move when the
objects TOUCH
Topic: Static Charge
Charging objects can be
done two ways:
1. Charging by inductioncharges move without
TOUCH
Topic: Static Charge
Charge
Polarization is the
process of separating
opposite charges
within an object. The
positive charge
becomes separated
from the negative
charge.
Diagram the
electric field lines
for the following
configuration of
two objects. Place
arrows on your
field lines.
Which is an example of
polarization?
Respond to the following student
statement:
"A positively charged object is an object
which has an excess of positive
electrons."
Opposites attract. And likes
repel.
Topic: Charge Movement
•Static Charges have Potential Energy.
•Potential Energy is stored energy.
Topic: Charge Movement
•Static Charges have Potential Energy.
•Potential Energy is stored energy.
•Electric Potential is the amount of
electric potential energy that a unit of
charge has at a certain position in an
electric field.
•Electric Potential is measured in
Volts
Topic: Charge Movement
•Charges can move only
if there is a
DIFFERENCE in electric
potential.
Topic: Charge Movement
•Charges can move only
if there is a
DIFFERENCE in electric
potential.
Examples of Charge
Movement
“Static Shock”
Opposites attract.
And likes repel.
Examples of Charge
Movement
Lightning
Opposites attract.
And likes repel.
Opposites
attract. And
likes repel.
Several electric field line patterns are shown in the diagrams below.
Which of these patterns are incorrect? _________ Explain what is
wrong with all incorrect diagrams.
Several electric field line patterns are shown in the diagrams below.
Which of these patterns are incorrect? _________ Explain what is
wrong with all incorrect diagrams.
Answer: C, D and E
In C, the lines are directed towards a positively charged object.
In D, the lines are not symmetrically positioned despite the fact
that the object is a symmetrical sphere.
In E, the lines are directed away from a negative charge.
Opposites attract. And likes
repel.