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1. Chapter Resources Click on one of the following icons to go to that resource. red.msscience.com Image Bank Foldables Video Clips and Animations Chapter Summary Chapter Review Questions Standardized Test Practice

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3. Image Bank Click on individual thumbnail images to view larger versions.

4. Image Bank Transfer Images • To transfer images to your own power point follow the following steps: • Open the “Resource” file from the CD-ROM disc – view the file in the “normal view” or “slide sorter view” mode - go to slide #2 – from there you can click through the images and follow these instructions. Click once on the image. • Copy the image • Go to your own power point document • Paste the image.

5. Image Bank Electric Charges

6. Image Bank The Force Between Charges

7. Image Bank Electric Field and Electric Forces

8. Image Bank Describing the Electric Field

9. Image Bank Charging by Induction

10. Image Bank Insulator

11. Image Bank Copper Electric Wire

12. Image Bank Electric Discharge

13. Image Bank Lightning Bolt

14. Image Bank Lightning Rod

15. Image Bank Electric Current

16. Image Bank A Simple Electric Circuit

17. Image Bank Electric Resistance

18. Image Bank A Model for Electron Flow

19. Image Bank Light Switch

20. Image Bank The Forces Between Magnetic Poles

21. Image Bank Magnetic Field

22. Image Bank Poles Pointing in Random Directions

23. Image Bank Poles Pointing in the Same Direction

24. Image Bank Electromagnets

25. Image Bank Magnetic Field

26. Image Bank Hydroelectric Plant

27. Foldables Electric and Magnetic Forces Make the following Foldable to help you understand the properties of electric forces and magnetic forces.

28. Foldables Fold a sheet of paper in half lengthwise.

29. Foldables Fold paper down about 2 cm from the top.

30. Foldables Open and draw lines along the horizontal fold. Label as shown.

31. Foldables Summarize in a Table As you read the chapter, summarize the properties of electric forces in the left column and properties of magnetic forces in the right column.

32. Video Clips Click image to view movie.

33. Video Clips Click box to view movie.

34. Video Clips Click image to view movie.

35. Video Clips Click image to view movie.

36. Reviewing Main Ideas 1 Electric Charge and Forces • Positive and negative charges are surrounded by an electric field that exerts forces on the other charges. • Two positive or two negative charges repel each other; a positive and a negative charge attract each other. • Charges can be transferred from one object to another. Charges in an object can be rearranged by an electric field.

37. Reviewing Main Ideas 2 Electric Current • An electric current is the flow of electric charges. A current will flow continually in a closed path called an electric circuit. • An electric field in a circuit causes charges to flow and transfer electrical energy. • Resistance is a measure of how difficult it is for electrons to flow in a material. • Voltage is a measure of the energy transferred by an electron as it flows in a circuit.

38. Reviewing Main Ideas 3 Magnetism • A magnet has a north pole and a south pole and is surrounded by a magnetic field. • Like magnetic poles repel each other and unlike poles attract each other. • Some materials are magnetic because their atoms behave like magnets.

39. Chapter Review Question 1 Like magnetic poles _______. A. attract B. disintegrate C. evaporate D. repel

40. Chapter Review Answer The answer is D. Remember that opposites attract.

41. Chapter Review Question 2 A magnetic domain is a region within an object in which the north and south poles of the atoms _______. A. are not pointing in any direction B. are pointing at the North Star C. are pointing random directions D. are pointing the same direction

42. Chapter Review Answer The answer is D; this is what defines a domain.

43. Chapter Review Question 3 What surrounds an electric current? Answer A magnetic field surrounds an electric current. This is part of the relationship between magnetism and electricity.

44. Chapter Review Question 4 Imagine a loop of current-carrying wire through which an iron core is passed. What will happen in the wire?

45. Chapter Review Answer Any magnetic field produced will become much stronger. The object is known as an electromagnet.

46. Chapter Review Question 5 When current flows through the filament in a light bulb, electrical energy is converted to _______ and _______. Answer The answer is heat and light. As a result, the filament glows, and lights up the room.

47. Standardized Test Practice Question 1 The imbalance of electric charge on an object is called _______. A. careful charge B. static charge C. temporal charge D. Z-charge

48. Standardized Test Practice Answer The answer is B. You can cause a static charge to build up on a balloon by rubbing it against your hair.

49. Standardized Test Practice Question 2 The rearrangement of electric charge due to the presence of an electric field is known as _______. A. charging by deduction B. charging by induction C. charging by reduction D. charging by suspension

50. The answer is B. When you charge by induction, the object still remains electrically neutral. It just has more positive charge on one side than the other. Standardized Test Practice Answer