NEW CHAPTER Electricity CHAPTER the BIG idea Moving electric charges transfer energy. Materials can become electrically charged. Charges can move from

NEW CHAPTER

ElectricityCHAPTER

thethe BIGBIG ideaidea

Moving electric charges transfer energy.

Materials can become electrically charged.

Charges can move from one place to another.

Electric current is a flow of charge.

CHAPTER OUTLINE

5.15.1

5.25.2

5.35.3

CHAPTER RESOURCES

VOCABULARY

KEY CONCEPT CHAPTER HOME

electric field

static charge

induction

electric charge


SECTION OUTLINESECTION OUTLINE

Electric charge is a property of matter.

Electrons have a negative charge.

5.15.1

CHAPTERRESOURCESCHAPTERRESOURCES

VOCABULARY


electric field

static charge

induction

electric charge




Protons have a positive charge.

5.15.1


VOCABULARY


electric field

static charge

induction

electric charge




Unlike charges attract.

5.15.1


VOCABULARY


electric field

static charge

induction

electric charge




Like charges repel.

5.15.1


VOCABULARY




electric field

static charge

induction

electric chargeStatic charges are caused by the movement of electrons, resulting in an imbalance of positive and negative charges.

At first, a balloon and a glass rod each have balanced, neutral charges.

5.15.1


VOCABULARY


When they touch, electrons move from the rod to the balloon.



electric field

static charge

induction


5.15.1


VOCABULARY




electric field

static charge

induction


Afterwards, the balloon has a negative charge, and the rod has a positive charge.

5.15.1


VOCABULARY




electric field

static charge

induction


5.15.1

SIMULATION

Learn more about static electricity.


VOCABULARY



SECTIONOUTLINESECTIONOUTLINE

volt

conductor

electric potential

insulator

resistance

ohm

grounding

1. Lightning strikes the lightning rod, because the rod is the path of least resistance.

2. The rod conducts the charge to a conductor cable, which has low resistance.

3. The ground wire conducts the charge into the ground, where it spreads out and becomes harmless.

Charge movement is affected by• electric potential, measured in volts• resistance, measured in ohms

A ground is the path of least resistance.

A conductor has low resistance.An insulator has high resistance.

5.25.2


VOCABULARY




Electric current is measured in amperes, or amps.

Electrochemical cells produce electric current through chemical reactions.

I = VR

Ohm's law states that current equals voltage divided by resistance.

Current = Resistance

Voltage

electric current

ampere

Ohm’s law

electric cell

5.35.3


VOCABULARY




Electric current is measured in amperes, or amps.

Electrochemical cells produce electric current through chemical reactions.

I = VR

Ohm's law states that current equals voltage divided by resistance.

Current = Resistance

Voltage

electric current

ampere

Ohm’s law

electric cell

5.35.3


SIMULATION

See Ohm’s law in action.

VOCABULARY


I. Materials can become electrically charged.

A. Electric charge is a property of matter.

B. Static charges are caused by the movement of electrons.

C. Technology uses static electricity.

1. Charging by Contact

2. How Materials Affect Static Charging

3. Charging by Induction

4. Charge Polarization


KEY CONCEPTSUMMARYKEY CONCEPTSUMMARY

electric field

static charge

induction

electric charge

5.15.1


VOCABULARY


II. Charges can move from one place to another.

A. Static charges have potential energy.

B. Materials affect charge movement.



volt

conductor

electric potential

insulator

resistance

ohm

grounding

1. Electric Potential Energy

2. Electric Potential

3. Charge Movement

4. Lightning

1. Conductors and Insulators

2. Resistance

3. Superconductors

4. Grounding

5.25.2


VOCABULARY


III. Electric current is a flow of charge.

A. Electric charge can flow continuously.

1. Current, Voltage, and Resistance

2. Ohm’s Law

3. Measuring Electricity

B. Electric cells supply electric current.

1. Electrochemical Cells

2. Solar Cells



electric current

ampere

Ohm’s law

electric cell

5.35.3


BACK TO CHAPTER

Click on the items below to access resources on

Standardized Test Practice Practice state standardized tests

Resource Centers Get more information on selectscience topics

Image GalleryClick here to view chapter images and animations

Math Tutorial Review math concepts

Content Review Review key concepts and vocabulary

CLASSZONE.COM

Chapter ResourcesChapter ResourcesCHAPTER HOME

Documents

NEW CHAPTER Electricity CHAPTER the BIG idea Moving electric charges transfer energy. Materials can become electrically charged. Charges can move from