Chapter 4 Electricity Chapter 4 Electricity and Magnetismand Magnetism

Lesson 1Lesson 1

By: Mr. VorickBy: Mr. Vorick

Lesson 1 Essential QuestionLesson 1 Essential Question

EQ: What is static electricity?EQ: What is static electricity?

H:H:

A:A:

VocabularyVocabulary

Electric chargeElectric charge: a basic property of : a basic property of the tiny particles that make up the tiny particles that make up matter. Electric charges can be matter. Electric charges can be positive or negative.positive or negative.

Static ElectricityStatic Electricity: The buildup of : The buildup of electric charges in one place.electric charges in one place.

Electric fieldElectric field: The area around : The area around electric charges, where electric electric charges, where electric forces can act.forces can act.

Lab: Rub a BalloonLab: Rub a Balloon

Why do you hang the balloon from Why do you hang the balloon from the table instead of holding it in your the table instead of holding it in your hand?hand?

What is the benefit of using several What is the benefit of using several different materials to rub the different materials to rub the balloons?balloons?

Lab: Rub a Balloon Lab: Rub a Balloon

1.) Compare your observations in steps 2 1.) Compare your observations in steps 2 and 3.and 3.

2.) Think about how the balloons and 2.) Think about how the balloons and materials acted. Compare that to what materials acted. Compare that to what sometimes happens when clothes are sometimes happens when clothes are taken from a dryer.taken from a dryer.

3.) Which of your observations support 3.) Which of your observations support the inference that a force acted on the the inference that a force acted on the balloons and the materials?balloons and the materials?

Two Kinds of ChangeTwo Kinds of Change

How does electricity work?How does electricity work?

Push and Pulls during the lab were Push and Pulls during the lab were caused by what?caused by what?

Electric ChargesElectric Charges

Basic property of the tiny particles Basic property of the tiny particles that make up matter.that make up matter.

Positive and NegativePositive and Negative + and – charges cancel each other + and – charges cancel each other

outout– Most matter usually has a balance of the Most matter usually has a balance of the

two chargestwo charges– This is called being neutralThis is called being neutral– How did you change this during the lab?How did you change this during the lab?

Electric ChargesElectric Charges

Negatively Charged: when an object Negatively Charged: when an object has more negatively charged has more negatively charged particles than positively chargedparticles than positively charged

Positively Charged: more positive Positively Charged: more positive than negatively charged particlesthan negatively charged particles

Opposite charges attract, charges Opposite charges attract, charges that are the same repel or push away that are the same repel or push away from each other.from each other.

Magnet exampleMagnet example

Static ElectricityStatic Electricity

The buildup of charges in one placeThe buildup of charges in one place

Lab: Rubbing the two balloons with Lab: Rubbing the two balloons with wool made each negatively charged wool made each negatively charged so they repel eachother. so they repel eachother.

Separating ChargesSeparating Charges

Most of the time, objects are neutralMost of the time, objects are neutral To see a change you must separate To see a change you must separate

negative charges from positive negative charges from positive chargescharges

How do you do this?How do you do this?

Rubbing Rubbing

Pulls negative particles off one object Pulls negative particles off one object onto and onto another.onto and onto another.

Only negative charges move this Only negative charges move this way, positive charges will not move.way, positive charges will not move.

Electric ForcesElectric Forces

The push or pull between objects The push or pull between objects that have different chargesthat have different charges

Electric Field: the space around Electric Field: the space around positive and electric charges.positive and electric charges.– The force gets weaker the farther you The force gets weaker the farther you

move from the objectmove from the object– The field extends is all directions from The field extends is all directions from

the chargethe charge– The field attracts opposite charges and The field attracts opposite charges and

repels identical chargesrepels identical charges

Essential QuestionEssential Question

EQ: What is static electricity?EQ: What is static electricity?

A:A: