1. To return to the chapter summary click Escape or close this document. glencoe.com Image Bank Foldables Video Clips and Animations Standardized Test Practice Chapter Resources Click on one of the following icons to go to that resource. Chapter Review Questions Chapter Summary

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3. To return to the chapter summary click Escape or close this document. Image Bank Click on individual thumbnail images to view larger versions.

4. To return to the chapter summary click Escape or close this document. Image Bank 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. Transfer Images

5. To return to the chapter summary click Escape or close this document. Image Bank Poles

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26. To return to the chapter summary click Escape or close this document. Foldables Magnetic Forces and Fields Make the following Foldable to help you see how magnetic forces and magnetic fields are similar and different.

27. To return to the chapter summary click Escape or close this document. Foldables Draw a mark at the midpoint of a vertical sheet of paper along the side edge.

28. To return to the chapter summary click Escape or close this document. Foldables Turn the paper horizontally and fold the outside edges in to touch at the midpoint mark.

29. To return to the chapter summary click Escape or close this document. Foldables Label the flaps Magnetic Force and Magnetic Field.

30. To return to the chapter summary click Escape or close this document. Foldables As you read the chapter, write information about each topic on the inside of the appropriate flap. After you read the chapter, compare and contrast the terms magnetic force and magnetic field. Write your observations under the flaps. Compare and Contrast

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35. To return to the chapter summary click Escape or close this document. 1 1 Reviewing Main Ideas All magnets have two poles—north and south. Like poles repel each other and unlike poles attract. What is Magnetism? A magnet is surrounded by a magnetic field that exerts forces on other magnets.

36. To return to the chapter summary click Escape or close this document. 1 1 Reviewing Main Ideas What is Magnetism? Earth is surrounded by a magnetic field similar to the field around a bar magnet. Atoms in magnetic materials are magnets. These materials contain magnetic domains which are groups of atoms whose magnetic poles are aligned.

37. To return to the chapter summary click Escape or close this document. 2 2 Reviewing Main Ideas Electricity and Magnetism A magnetic field exerts a force on a moving charge or a current-carrying wire. Electric current creates a magnetic field. Electromagnets are made from a coil of wire that carries a current, wrapped around an iron core.

38. To return to the chapter summary click Escape or close this document. 2 2 Reviewing Main Ideas Electricity and Magnetism Transformers are used to increase and decrease voltage in AC circuits. Motors transform electric energy into kinetic energy. Generators transform kinetic energy into electric energy.

39. To return to the chapter summary click Escape or close this document. Question 1 Chapter Review Which of the following will increase the strength of an electromagnet? A. Increase the number of coils. B. Decrease the number of coils. C. Remove the iron core. D. Decrease the current in the coils. PS 4.4

40. To return to the chapter summary click Escape or close this document. Answer Chapter Review The answer is A. You can see this yourself by wrapping a current-carrying wire around a steel nail.

41. To return to the chapter summary click Escape or close this document. Question 2 Chapter Review Whether a transformer increases or decreases the input voltage depends on _______. Answer The ratio of the number of coils on the input side and the output side determines whether the transformer increases or decreases the voltage. PS 4.4

42. To return to the chapter summary click Escape or close this document. Question 3 Chapter Review Which class of lever is shown in this diagram? A. electromagnet B. generator C. superconductor D. transformer PS 4.4d

43. To return to the chapter summary click Escape or close this document. Answer Chapter Review The answer is A. An electric doorbell uses an electromagnet. Each time the electromagnet is turned on, the doorbell rings.

44. To return to the chapter summary click Escape or close this document. Question 4 Chapter Review What device would you use to measure the current in a circuit? A. motor B. ammeter C. galvanometer D. generator PS 4.4

45. To return to the chapter summary click Escape or close this document. Answer Chapter Review The answer is B. Connect the ammeter in series to the circuit, allowing all the current in the circuit to flow through it.

46. To return to the chapter summary click Escape or close this document. Question 5 Chapter Review A group of atoms in which all magnetic fields are pointing in the same direction is known as what? PS 4.4g

47. To return to the chapter summary click Escape or close this document. Answer Chapter Review It is known as a magnetic domain. By causing the magnetic domains in a piece of iron to become oriented, the iron can be magnetized.

48. To return to the chapter summary click Escape or close this document. Standardized Test Practice Question 1 To reduce the amount of electric energy converted into heat in power lines, the electric energy is transmitted at a high _____. A. voltage B. current C. resistance D. frequency PS 4.4d

49. To return to the chapter summary click Escape or close this document. Standardized Test Practice Answer The answer is A. Transformers are used to reduce the voltage so that the energy can be used more safely by households.

50. To return to the chapter summary click Escape or close this document. Standardized Test Practice Question 2 A device that changes the voltage of an alternating current is a _______. A. galvanometer B. generator C. transformer D. voltmeter PS 4.4

51. To return to the chapter summary click Escape or close this document. Standardized Test Practice Answer The answer is C. Transformers are used to increase and decrease the voltage when transmitting electric current through power lines.

52. To return to the chapter summary click Escape or close this document. Standardized Test Practice Question 3 A material that exhibits no resistance to the flow of electrons is a _______. A. insulator B. superconductor C. conductor D. magnetic domain PS 4.4

53. To return to the chapter summary click Escape or close this document. Standardized Test Practice Answer The answer is B. Superconductors are formed when certain materials are cooled to low temperatures.

54. To return to the chapter summary click Escape or close this document. Standardized Test Practice Question 4 Some materials are magnetic because their ______ behave like small magnets. A. nuclei B. atoms C. electrons D. compounds PS 4.4g

55. To return to the chapter summary click Escape or close this document. Standardized Test Practice Answer The answer is B. Magnetic materials are made of atoms that are like small magnets.

56. To return to the chapter summary click Escape or close this document. Standardized Test Practice Question 5 The magnetic field around a magnet is _____ where the magnetic field lines are closer together. PS 4.4g

57. To return to the chapter summary click Escape or close this document. Standardized Test Practice Answer The answer is C. For any magnet, the magnetic field lines are closest together at the magnetic poles.

58. To return to the chapter summary click Escape or close this document. To advance to the next item or next page click on any of the following keys: mouse, space bar, enter, down or forward arrow. Click on this icon to return to the table of contents Click on this icon to return to the previous slide Click on this icon to move to the next slide Click on this icon to open the resources file. Help Click on this icon to go to the end of the presentation.

59. To return to the chapter summary click Escape or close this document. End of Chapter Resources File