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Positive and negative charges, fourth grade.

Ruben Ybarra

on 2 April 2014

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Transcript of Electricity

What Is An Electrical Charge?
Everything is made up of tiny particles called
too small to be seen.
Two Types of Electrical Charges
Each of these tiny particles can have an electrical charge. There are two kinds of electrical charges, positive ( ) and negative ( ).
Positive and Negative Charges
Particles with the
same charge
will repel (push away) each other.
Particles with
opposite charge
will attract (pull towards) each other.
Two positive charges repel each other
Two negative charges repel each other
Opposite charges attract each other
Charges Add Up
Most objects are made up of the same number of positive and negative charges. Objects with the same number of both charges are neutral.
When two objects touch or nearly touch, charged particles can move from one object to the other object more easily than positive charges.
For example, rub a balloon with a wool cloth:
negative charges move from the wool to the balloon
the balloon now has more negative charges than positive charges. The balloon is negatively charged.
Now You Try:
Draw arrows in between these particles to show if these two charges are attracting or repelling.


Today We Learned:

1. There are two kinds of electrical charges: positive ( ) and negative ( ).
2. Two particles with the same charges will repel each other.
3. Two particles with opposite charges will attract each other.
4. Charge particles can move from object to object.
Today We Will Learn About:
1. Positive and Negative charged particles.
2. How two same charge particles behave.
3. How two opposite charged particles behave.
4. What happens when two charged objects get close to one another.
Static Electricity
Today we will:
define static electricity
discuss the properties of static electricity
conduct an experiment
A buildup of negative charges on an object is called
static electricity
A balloon starts out with the same number of positive charges and negative charges. Rubbing causes buildup of negative charges on the balloon. There are more negative charges on the balloon than positive charges. The balloon is negatively charged.
Shake some of the salt and pepper mixture onto a piece of paper.
Try to find the best way to separate the salt and the pepper into two piles.
Record your observations:

What is happening to the salt and pepper? Why do you think this is happening?
Classroom Expectations
Be Respectful
Be Responsible
Be Safe
When the spoon is rubbed, it becomes negatively charged. The salt and pepper are both positively charged, which means they are attracted to the static from the spoon. When the spoon is placed over the mixture, the peppers fly up and attract.
Why do the pepper particles attract while the salt doesn't?
Pepper particles are much lighter than the salt so they are quicker to attract to the spoon. If you were to bring the spoon closer to the mixture, the heaver salt would eventually cling to the spoon as well.
Full transcript