Unit 5 Electricity and Magnetism

Transcription

1 Unit 5 Electricit and Magnetism Overview In this unit, students explore the properties, quantities, principles, and laws of electricit, magnetic fields, and electromagnetic induction. The carr out experiments or simulations, and build a prototpe device, to demonstrate properties of magnetic fields and electromagnetic induction. Also, the identif and describe examples of domestic and industrial technologies that are applications of magnetic fields. The curriculum emphasis in this unit is technolog. This includes the design of a prototpe device that applies the principles of electromagnetism (expectation EM2.04), a description of technological sstems (expectation EM3.01), and a description of the historical development of technologies (expectation EM3.02). Chapter 12, Electricit, presents electrostatics and current electricit. Some components of this chapter are a review of the content of the electricit unit in grade 9 science. Chapter 13, Electromagnetism, explores the magnetic effects and applications of electric current. Chapter 14, Electromagnetic Induction, presents the complement of the concepts in Chapter 13, namel the induction of electric current using magnetism, and the applications of this electromagnetic induction. CONTENT SUGGESTIONS General Comments The following facts will help in planning the content of Unit 5: Individual sections do not alwas fit into one class period; some need less time, and some need more time. The ke expectations are often covered in more than one wa or in more than one section. Thus, choices can be made to save time or to adapt to the prior knowledge and skills of the students. The are meant for student practice, not for assessment. Some students ma reduce the time the spend on those questions b doing rough solutions rather than formal solutions for evaluation or assessment. (The Section Questions are meant for assessment.) As ou will notice in the Prerequisite Knowledge and Skills, students in Ontario have been exposed to the topics of electrostatics, current electricit, magnetism, and electromagnetism a lot in previous grades. Thus, it is a good idea to determine what knowledge and skills the students bring with them to class, and build on them. The Unit 5 Performance Task (pages 540 1) can be used to cover several of the specific expectations, including EM2.04, EM3.01, and EM3.02. To comfortabl complete all parts of all sections of Unit 5 will take approximatel 30 class periods. Thus, choices must be made to cover the curriculum emphases while giving the students a positive experience in the time available. TEACHING SUGGESTIONS Discuss the introductor photograph and the feature on Dr. Mehrdad on page 419 of the text. Discuss with the students the expectations for the unit and the assessment rubrics (found in this manual). Have our students work on the Are You Read? diagnostic assignment on pages SPECIFIC SUGGESTIONS The suggestions in Table 1 are based on these assumptions: Class periods are 70 to 75 min long. Five units are to be covered in a little more than 100 periods, so on average each unit should be completed within about 20 periods, including assessment and evaluation Nelson Thomson Learning Unit 5 Electricit and Magnetism 295

2 Table 1 Unit 5 Planning Pathwa Topic Period Content Comments, Including Time-Saving Strategies Ch Intro; 12.1 Discuss some of the questions on pages orall. Discuss the introduction to section 12.1 briefl. Do Investigation , the Tr This Activit, and Activit as class demonstrations to review what the students learned about electrostatics in grade 9 science. Assign the Section 12.1 Questions for homework ; 12.3 The concepts in section 12.2 are introduced to help students understand magnetic fields later in the unit; however, electric fields and Coulomb s law are optional, so if time is limited the can be treated briefl or omitted. Section 12.3 should be emphasized in this period ; 12.5 Electric potential is a compulsor component of the course, so emphasize section Electric circuits and Kirchhoff s laws are optional, so section 12.5 can be treated as a brief review of electric circuits studied in grade 9 science ; 12.7 Although Ohm s law is not a written requirement in the course expectations, it is needed for the mathematical analsis of other topics, including power and the use of transformers. Thus, a brief review of the topic in section 12.6 is recommended. In section 12.7, emphasize the equation related to power. If time is limited, ou can omit the topic on the cost of electricit, pages Review Quiz Since much of Chapter 12 is a review of the grade 9 unit on electricit, the tpical chapter review and test can be replaced with a student-controlled review and self-test. Students can use the Chapter 12 Summar (page 467) and Review (pages 468 9) to complete Chapter 12. Ch Intro; 13.1 Students have not studied magnetism in the science curriculum since grade 3, so the will benefit greatl from activities and demonstrations involving magnetic forces and fields. To ensure ample time for the Tr This Activit on page 471 and Activit on page 473, some questions can be assigned for homework This section can be completed fairl easil in one class period. If ou haven t alread done so, now would be a good time to introduce the Unit 5 Performance Task, pages 540 1, so students who will be doing it can begin thinking about what the will do ; 13.4 start Since section 13.4 is relativel long and is related to section 13.3, it is a good idea to begin 13.4 in this period. Plan on getting to the end of page 483 or finish Complete the parts of section 13.4 not done in the previous period. 296 Unit 5 Overview 2002 Nelson Thomson Learning

3 Topic Period Content Comments, Including Time-Saving Strategies ; 13.6 start Section 13.5 can easil be done in a single period, but if ou intend to have the students build an electric motor (in Activit ), ou should begin section 13.6 in this period. To save time, Investigation could be done as a class demonstration finish If ou intend to have students work on the Unit 5 Performance Task, then the construction of a simple DC motor (Activit ) is not mandator. However, an student not doing the Performance Task should consider building the motor or another device that operates on the principles of electromagnetism. (See expectation EM2.04.) The Case Stud on pages can be done fairl quickl, but the Explore an Issue feature on page 501 will require extra time for researching and reporting on the issue. 12 Review Some items on pages can be assigned as compulsor and some as optional, and some can be discussed orall. 13 Test After the test, students can begin working on Chapter 14. Ch Intro; 14.1 start The Chapter 14 introduction leads directl to section Plan on completing to the end of Investigation (pages 508 9) in this period. Complete section 14.1, and do section To save time, Activit could be done as a class demonstration finish; See the Teaching Suggestions for section 14.3 for ideas on demonstrations and activities to engage the students in this topic The planning of this section is straightforward ; Career Section 14.5 can be combined with the Career feature on page Review Some items on pages can be assigned as compulsor and some Test as optional, and some can be discussed orall. Review 20 Unit Review Make a list of questions on pages that ou recommend students work on for their review of Unit 5. Test 21 Unit Test After the Unit 5 test, students can begin working on a review for the final examination Nelson Thomson Learning Unit 5 Electricit and Magnetism 297

4 Curriculum and Assessment Map for Unit 5 Overall Expectations EMV.01 demonstrate an understanding of the properties, phsical quantities, principles, and laws related to electricit, magnetic fields, and electromagnetic induction EMV.02 carr out experiments or simulations, and construct a prototpe device, to demonstrate characteristic properties of magnetic fields and electromagnetic induction EMV.03 identif and describe examples of domestic and industrial technologies that were developed on the basis of the scientific understanding of magnetic fields Section Overall Expectations Electrostatics Achievement Chart Categories Inquir Assessment/Evaluation Opportunities (Evidence) q. 1 6 Section 12.1 Questions q. 1 7 Section 12.1 Questions Appling Inquir Skills, q. 8 9 Investigation Analsis a f, Evaluation g h Communication Activit Tr This Activit Section 12.1 Questions Making, q Reflecting, q. 13 Making Section 12.1 Questions Making, q Assessment Tools 298 Unit 5 Overview 2002 Nelson Thomson Learning

5 Section 12.2 Electric Fields and Electric Charge 12.3 Electric Current 12.4 Electric Potential Difference Overall Expectations Achievement Chart Categories Inquir Communication Assessment/Evaluation Opportunities (Evidence) q. 1 2 Section 12.2 Questions q. 1 7 Section 12.2 Questions Appling Inquir Skills, q Lab Exercise Analsis, a b Section 12.2 Questions Reflecting, q. 11 Making Lab Exercise Analsis, b Inquir Communication Making q. 1 5 Section 12.3 Questions q. 1 6, EM1.08 Section 12.3 Questions Appling Inquir Skills, q. 10 Section 12.3 Questions q. 7 9 Reflecting, q. 12, EM 1.02 Section 12.3 Questions Making, q. 11, EM 1.02 q. 1 6 Section 12.4 Questions q. 1 6 Assessment Tools 2002 Nelson Thomson Learning Unit 5 Electricit and Magnetism 299

6 Section 12.5 Kirchhoff s Laws for Electric Circuits 12.6 Electric Resistance Overall Expectations Achievement Chart Categories Inquir Communication Making Inquir Communication Making Inquir Communication Making Assessment/Evaluation Opportunities (Evidence) Section 12.4 Questions Appling Inquir Skills, q Section 12.4 Questions q. 7 Section 12.4 Questions q q. 1 Section 12.5 Questions q. 1 6 Section 12.5 Questions Appling Inquir Skills, q. 7 Activit Analsis, a b Section 12.5 Questions Reflecting, q. 10 Section 12.5 Questions Making, q. 8 9 q Section 12.6 Questions q. 1 7 Section 12.6 Questions Appling Inquir Skills, q Section 12.6 Questions Making, q. 12 Section 12.6 Questions Making, q. 11 Assessment Tools 300 Unit 5 Overview 2002 Nelson Thomson Learning

7 Section 12.7 Power in Electric Circuits 13.1 Magnetic Force and Fields 13.2 Magnetic Materials Overall Expectations Achievement Chart Categories Inquir Communication Making Inquir Communication Making Assessment/Evaluation Opportunities (Evidence) q. 1 8 Section 12.7 Questions q Section 12.7 Questions Appling Inquir Skills, q. 11 Section 12.7 Questions Making, q. 13 Section 12.7 Questions Making, q. 12, 14 q. 1 2, EM1.03 Section 13.1 Questions q. 1 3, EM1.03 Appling Inquir Skills, q. 3 6, EM2.01 Activit Observations, a d, EM1.03, EM2.01 Section 13.1 Questions Reflecting, q. 6, EM1.03 Section 13.1 Questions Making, q. 5 EM1.03 q. 1 6, EM1.03 Section 13.2 Questions q. 1 2, EM1.03 Assessment Tools 2002 Nelson Thomson Learning Unit 5 Electricit and Magnetism 301

8 Section 13.3 Oersted s Discover 13.4 The Magnetic Field of a Coil or Solenoid Overall Expectations Achievement Chart Categories Inquir Communication Making Assessment/Evaluation Opportunities (Evidence) Section 13.2 Questions Appling Inquir Skills, q. 4 EM1.03 Tr This Activitq. a b EM1.03 Section 13.2 Questions q. 3 EM1.03 Section 13.2 Questions Making, q. 5 EM1.03 q. 1 3 EM1.04, EM1.05 Section 13.3 Questions q. 1 3 EM1.04, EM1.05 Inquir Activit Observations, a b EM1.04, EM1.05, EM2.02 Communication Section 13.3 Questions Reflecting, q. 4 EMV.03 Making Activit Observations, c EM1.04, EM1.05, EM2.02 q. 1 6 EM1.04, EM1.05 Section 13.4 Questions q. 1 8 EM1.04, EM1.05 Inquir Activit Observations, a d EM1.04, EM1.05, EM2.02 Tr This Activit EM1.04, EM1.05, EM2.02 Communication Section 13.4 Questions Making, q. 10 EM1.04, EM1.05 Making Making, q. 7 EM1.04, EM1.05 Section 13.4 Questions Making, q. 9 EM1.04, EM1.05 Assessment Tools 302 Unit 5 Overview 2002 Nelson Thomson Learning

9 Section 13.5 Conductor in a Magnetic Field The Motor Principle 13.6 Applications of the Motor Principle 14.1 Farada s Discover Overall Expectations Achievement Chart Categories Inquir Communication Assessment/Evaluation Opportunities (Evidence) Section 13.5 Questions q. 1 2 EM1.04, EM1.05, EM1.06 Section 13.5 Questions Appling Inquir Skills, q. 3 4 EM1.04, EM1.05, EM1.06 Investigation Analsis, a e, Evaluation, f EM1.04, EM1.05, EM1.06 Section 13.5 Questions Reflecting, q. 5 EM1.06 Making Investigation Evaluation, g EM1.06 Inquir Communication Making q. 1 7 EM1.06 Section 13.6 Questions q. 1 6 EM1.06 Section 13.6 Questions Appling Inquir Skills, q. 7 8 EM1.06 Activit Analsis, a b EM1.06, EM2.04, EM3.01 Section 13.6 Questions Reflecting, q. 10 EM1.06 Explore an Issue EM3.01 Section 13.6 Questions Making, q. 9 EM1.06 q. 1 EM1.07 Section 14.1 Questions q. 1 6 EM1.07 Inquir Investigation Analsis, c d, f h EM1.07, EM2.03 Assessment Tools 2002 Nelson Thomson Learning Unit 5 Electricit and Magnetism 303

10 Section 14.2 Direction of Induced Current 14.3 Electric Generators: AC and DC 14.4 The Transformer Overall Expectations Achievement Chart Categories Assessment/Evaluation Opportunities (Evidence) Communication Investigation Evaluation, i EM1.07, EM2.03 Making Investigation Analsis, e EM1.07, EM2.03 q. 1 2 EM1.07, EM3.01, EM3.02 Section 14.2 Questions q. 1 4 EM1.07 Inquir Activit Analsis, a EM1.07, EM2.03 Communication Activit Analsis, b EM1.07, EM2.03 Making Making, q. 3 EM1.07, EM3.01, EM3.02 Inquir Making Section 14.3 Questions q. 1 4 EM1.07, EM1.08, EM3.01, EM3.02 Tr This Activit EM1.07, EM1.08 Section 14.3 Questions Making, q. 5 EM1.07, EM1.08 q. 1 5 EM1.09, EM3.01, EM 3.02 Section 14.4 Questions q. 1 6 EM1.09, EM3.01, EM 3.02 Inquir Investigation Analsis, b f, Evaluation, g h EM1.09, EM3.01, EM 3.02 Communication Section 14.4 Questions Making, q. 7c EM1.09, EM3.01, EM 3.02 Making Section 14.4 Questions Making, q. 7 EM1.09, EM3.01, EM 3.02 Assessment Tools 304 Unit 5 Overview 2002 Nelson Thomson Learning

11 Section 14.5 Distribution of Electrical Energ Overall Expectations Achievement Chart Categories Inquir Communication Making Assessment/Evaluation Opportunities (Evidence) q. 1 3 EM1.08, EM1.09, EM3.01, EM3.02 Section 14.5 Questions q. 1 6 EM1.08, EM1.09, EM3.01, EM3.02 Explore an Issue SIS.04 Explore an Issue EM3.01, EM3.02 Career activit Making, q. 1 SIS.12 Explore an Issue Section 14.5 Questions Making, q EM1.08, EM1.09, EM3.01, EM3.02 Assessment Tools Prerequisite Knowledge and Skills The following are samples of specific expectations from Ontario s grades 7 to 9 curriculum that relate to Unit 5. (See the Ontario Guidelines for full details.) Grade 7 Heat compare the motion of particles in a solid, a liquid, and a gas using the particle theor Grade 9 The Characteristics of Electricit describe the properties of static electric charges, and explain electrostatic attraction and repulsion using scientific models of atomic structure describe charging b contact and b induction compare qualitativel static electricit and electric current describe the concepts of electric current, potential difference, and resistance, with the help of a water analog explain how electric current, potential difference, and electrical resistance are measured using an ammeter and a voltmeter state the SI units of potential difference, electric current, electrical resistance, electrical energ, and power describe the relationship among electrical resistance, potential difference, and current; solve simple problems involving the quantities describe the potential difference and current characteristics in a series and a parallel circuit compare the electrical resistance of a series and parallel connection of identical resistors to that of a single resistor determine quantitativel the percent efficienc of an electrical device that converts electrical energ to other forms of energ 2002 Nelson Thomson Learning Unit 5 Electricit and Magnetism 305

12 describe the relationship among electrical energ transformed, power, and elapsed time, and solve simple problems involving these phsical quantities compare methods of producing electrical energ, including their advantages and disadvantages demonstrate knowledge of electrical safet procedures when planning and carring out an inquir and choosing and using materials, tools, and equipment demonstrate the skills required to plan and conduct an inquir into electricit, using instruments, tools, and apparatus safel, accuratel, and effectivel design, draw, and construct series and parallel circuits for a given purpose, and measure current, potential difference, and resistance at various points in the circuit, using appropriate instruments and SI units charge an electroscope b contact and b induction predict, verif, and explain the effect of a nearb charged object on a charged electroscope use appropriate instruments and techniques to investigate potential difference against current for an ohmic resistor in a simple series circuit, graph the data, and determine resistance from the slope of the graph Ke Inquir and Communication Skills As students begin this unit, the should Be familiar with the meanings, use, and conversion of metric prefixes; for a review, refer to Appendix C, page 576, in the text. Be aware of how to perform a controlled experiment involving three variables (see Investigation ); for suggestions, see Appendix A1, page Be able to write lab reports; for suggestions, refer to Appendix A4, pages Be able to appl decision making to issues related to the topics of electricit and electromagnetism; for reference, see Appendix A2, pages Be proficient in appling math skills such as writing numbers in scientific notation, rounding off answers to the correct number of significant digits, appling equations to solve problems, using dimensional analsis, and drawing and interpreting graphs; see Appendix A5, pages Be able to use a variet of resources, including the Internet, to research topics related to electricit and electromagnetism. Ke Technical and Safet Skills As students begin this unit, the should Displa wise safet practices when participating in an lab activit; refer to Appendixes B1 and B2 on pages Be able to use mechanical and electrical equipment such as a connecting wires, clips, voltmeters, ammeters, power supplies, magnets, magnetic compasses, electroscopes, and solenoids. Making As students progress through this unit, the should Be capable of recognizing and/or explaining the connections between the science principles presented and the applications to technolog, societ, and the environment. 306 Unit 5 Overview 2002 Nelson Thomson Learning

13 Unit 5 Investigation/Activit/Lab Exercise/Tr This Activit Chart and Skills Menu Summar Chapter 12 Investigations, Activities, Lab Exercises, Tr This Activities Title Purpose Question Prediction/ Hpothesis Tr This Activit: to test students Safet and awareness and Electricit knowledge of electrical safet Investigation : Electric Charges and Forces Tr This Activit: Charging b Contact Activit Charging b Induction Lab Exercise : Investigating Data from Millikan s Oil Drop Experiment Activit : Cells in Series and in Parallel to investigate the laws of electric charge and appl the Bohr- Rutherford model of the atom to investigate how to charge a neutral object b contact to investigate how to charge an object b induction to investigate data similar to values measured b Millikan and look for patterns to investigate Kirchoff s voltage law Completed b Student Design Materials Procedure Evidence Analsis Evaluation Snthesis

14 Chapter 13 Title Purpose Question Prediction/ Hpothesis Tr This Activit: to use a bar Making a Magnet magnet to magnetize a steel paper clip Activit : Magnetic Fields Tr This Activit: Magnetic Induction Activit : Magnetic Field of a Straight Conductor Activit : Magnetic Field of a Coil Tr This Activit: Testing an Electromagnet to investigate the properties of magnetic fields around bar magnets to investigate the properties of magnetic induction and soft and hard iron to investigate the characteristics of the magnetic field around a straight conductor to investigate the characteristics of the magnetic field around a coil to investigate the factors that can affect the strength of an electromagnet Design Materials Procedure Evidence Analsis Evaluation Snthesis

15 Title Purpose Question Prediction/ Design Materials Procedure Evidence Analsis Evaluation Snthesis Hpothesis Investigation : The Motor Principle to investigate the conditions that cause a currentcarring conductor to experience a force Activit Constructing a Simple DC Motor to construct, test, and refine a simple DC motor Chapter 14 Title Purpose Question Prediction/ Hpothesis Tr This Activit: A Demonstration of Electromagnetic Induction to investigate and note several instances of electromagnetic induction Design Materials Procedure Evidence Analsis Evaluation Snthesis Investigation : Inducing Current in a Coiled Conductor Tr This Activit: Farada s Iron Ring to investigate how to produce a current in a coil using a bar magnet and the factors that determine the magnitude of the induced current to investigate the conditions that produce an induced current in the secondar coil of Farada s iron ring

16 Title Purpose Question Prediction/ Hpothesis Activit : to investigate the The Direction of direction of the Induced Current induced current in a coiled conductor Tr This Activit: AC Generator Demonstration Investigation : Transformers (Teacher Demonstration) Tr This Activit: Demonstration of Edd Currents to investigate the connection between Lenz s law and the induced current from generators to investigate the relationship between the input and output voltages and the number of windings in the primar and secondar coils to investigate induced edd currents and the effect on a falling magnet Design Materials Procedure Evidence Analsis Evaluation Snthesis Performance Task Title Purpose Question Prediction/ Hpothesis Technolog Trade to allow students Show to design, create, test, and present a technological device Design Materials Procedure Evidence Analsis Evaluation Snthesis

17 Materials List for Unit 5 Students need the following items to perform the investigations, activities, lab exercises, and Tr This activities in Unit 5. The number of items required is based on a class of 30 students working in pairs. Unless stated otherwise, 15 items are required. An following the number means 15 times that number (i.e., 3 means 45 of that particular item). Where the term item is inappropriate, such as for a piece of tubing or masking tape, the teacher must look at the individual activit or investigation to obtain appropriate quantities. Activit or Investigation Text Page Materials Investigation : Electric Charges and Forces (Chapter 12) ebonite rods or polethlene strips and fur insulated rod hanger glass rods or acetate strips and silk pith ball suspended on thread small bits of paper sawdus iron filings Tr This Activit: Charging b Contact (Chapter 12) Activit : Charging b Induction (Chapter 12) Activit : Cells in Series and in Parallel (Chapter 12) Tr This Activit: Making a Magnet (Chapter 13) Activit : Magnetic Fields (Chapter 13) Tr This Activit: Magnetic Induction (Chapter 13) Activit : Magnetic Field of a Straight Conductor (Chapter 13) Activit : Magnetic Field of a Coil (Chapter 13) 428 ebonite rods and fur glass rods and silk pith ball or leaf electroscope 429 ebonite rod and fur (or glass rod and silk) two metal rods two glass beakers pith ball or leaf electroscope 448 voltmeter two or three cells that have the same voltage connecting wires (4) load (for example, a 25-Ω resistor) 471 steel paper clips compass bar magnet 473 two bar magnets iron filings sheet of acetate (or paper) small compass 476 permanent magnet iron nail several metal washers cm of bare 12-gauge copper wire piece of stiff cardboard, 15 cm 15 cm batter (6 V 12 V) or DC power suppl iron filings connecting wires with alligator clips four compasses cm of bare 12-gauge copper wire wooden dowel (about 15 cm long 4 cm diameter) stiff cardboard and scissors batter (6 V 12 V) or DC power suppl connecting wires with alligator clips iron filings 2 compasses 2002 Nelson Thomson Learning Unit 5 Electricit and Magnetism 311

18 Activit or Investigation Text Page Materials Tr This Activit: Testing an Electromagnet (Chapter 13) cm of bare 12-gauge copper wire wooden dowel (about 15 cm long 4 cm diameter) different substances (clinders) to be placed in core batter (6 V 12 V) or DC power suppl connecting wires with alligator clips metal washers or metal paper clips Investigation : The Motor Principle (Chapter 13) Activit : Constructing a Simple DC Motor (Chapter 13) Tr This Activit: A Demonstration of Electromagnetic Induction (Chapter 14) Investigation : Inducing Current in a Coiled Conductor (Chapter 14) Tr This Activit: Farada s Iron Ring (Chapter 14) Activit : The Direction of Induced Current (Chapter 14) Tr This Activit: AC Generator Demonstration (Chapter 14) Investigation : Transformers (Teacher Demonstration) (Chapter 14) Tr This Activit: Demonstration of Edd Currents (Chapter 14) insulated wire (fine) retort stand, clamp, and metre stick 5-cm length of bare 12-gauge copper wire pair of bar magnets 6-V batter or DC power suppl insulated wire tape pencil pin 2 common iron nails (about 7 cm long) 6-V batter, or DC power suppl block of wood cardboard 507 soft iron core coil bar magnet galvanometer or milliammeter connecting wires galvanometer or ammeter horseshoe magnet coil with a hollow core pair of bar magnets two similar solenoids of 300 and 600 turns 510 Farada s iron ring apparatus DC power suppl (batter) galvanometer or ammeter coiled conductor galvanometer or ammeter magnet connecting wires 520 generator (hand crank) connecting wires (if needed) small light bulb lab transformer set (iron core and several coils with different numbers of turns) variac (AC variable voltage power source) two AC multi-range voltmeters 6-V or 12-V batter DC voltmeter nichrome wire or long finishing nail water hollow dish-shaped ring of metal with wooden handle 526 long copper tube two similar clindrical pieces of metal (strong magnet, unmagnetized) 312 Unit 5 Overview 2002 Nelson Thomson Learning

19 Materials Activit or Investigation batter (6 V or 12 V) or DC power suppl Activit : Magnetic Field of a Straight Conductor (Chapter 13), text page 480; Activit : Magnetic Field of a Coil (Chapter 13), text page 484; Tr This Activit: Testing an Electromagnet (Chapter 13), text page 488; Investigation : The Motor Principle (Chapter 13), text pages 492 3; Activit : Constructing a Simple DC Motor (Chapter 13), text pages 498 9; Tr This Activit: Farada s Iron Ring (Chapter 14), text page 510; Investigation : Transformers (Teacher Demonstration) (Chapter 14), text pages cardboard, stiff (and scissors) Activit : Magnetic Field of a Straight Conductor (Chapter 13), text page 480; Activit : Magnetic Field of a Coil (Chapter 13), text page 484; Activit : Constructing a Simple DC Motor (Chapter 13), text pages cells, two or three that have the same voltage Activit : Cells in Series and in Parallel (Chapter 12), text page 448 coil (with a hollow core) Tr This Activit: A Demonstration of Electromagnetic Induction (Chapter 14), text page 507; Investigation : Inducing Current in a Coiled Conductor (Chapter 14), text pages coiled conductor Activit : The Direction of Induced Current (Chapter 14), text pages compass Tr This Activit: Making a Magnet (Chapter 13), text page 471; Activit : Magnetic Fields (Chapter 13) text 473; Activit : Magnetic Field of a Straight Conductor (Chapter 13), text page 480; Activit : Magnetic Field of a Coil (Chapter 13), text page 484 connecting wires (with alligator clips) Activit : Cells in Series and in Parallel (Chapter 12), text page 448; Activit : Magnetic Field of a Straight Conductor (Chapter 13), text page 480; Activit : Magnetic Field of a Coil (Chapter 13), text page 484; Tr This Activit: Testing an Electromagnet (Chapter 13), text page 488; Investigation : Inducing Current in a Coiled Conductor (Chapter 14), text pages 508 9; Activit : The Direction of Induced Current (Chapter 14), text pages 513 4; Tr This Activit: AC Generator Demonstration (Chapter 14), text page Nelson Thomson Learning Unit 5 Electricit and Magnetism 313

20 Materials copper tube copper wire, bare 12-gauge different substances (clinders) to be placed in core dowel, wooden (15 cm long 4 cm diameter) ebonite rods or polethlene strips and fur Farada s iron ring apparatus galvanometer or milliammeter generator (hand crank) and small light bulb glass beakers glass rods or acetate strips and silk insulated rod hanger insulated wire (fine) iron core, soft Activit or Investigation Tr This Activit: Demonstration of Edd Currents (Chapter 14), text page 526 Activit : Magnetic Field of a Straight Conductor (Chapter 13), text page 480; Activit : Magnetic Field of a Coil (Chapter 13), text page 484; Tr This Activit: Testing an Electromagnet (Chapter 13), text page 488; Investigation : The Motor Principle (Chapter 13), text pages Tr This Activit: Testing an Electromagnet (Chapter 13), text page 488 Activit : Magnetic Field of a Coil (Chapter 13), text page 484; Tr This Activit: Testing an Electromagnet (Chapter 13), text page 488 Investigation : Electric Charges and Forces (Chapter 12), text pages 425 6; Tr This Activit: Charging b Contact (Chapter 12), text page 428; Activit : Charging b Induction (Chapter 12), text page 429 Tr This Activit: Farada s Iron Ring (Chapter 14), text page 510 Tr This Activit: A Demonstration of Electromagnetic Induction (Chapter 14), text page 507; Investigation : Inducing Current in a Coiled Conductor (Chapter 14), text pages (or ammeter); Tr This Activit: Farada s Iron Ring (Chapter 14), text page 510 (or ammeter); Activit : The Direction of Induced Current (Chapter 14), text pages (or ammeter), Tr This Activit: AC Generator Demonstration (Chapter 14), text page 520 Activit : Charging b Induction (Chapter 12), text page 429 Investigation : Electric Charges and Forces (Chapter 12), text pages 425 6; Tr This Activit: Charging b Contact (Chapter 12), text page 428 Investigation : Electric Charges and Forces (Chapter 12), text pages Investigation : The Motor Principle (Chapter 13), text pages 492 3; Activit : Constructing a Simple DC Motor (Chapter 13), text pages Tr This Activit: A Demonstration of Electromagnetic Induction (Chapter 14), text page Unit 5 Overview 2002 Nelson Thomson Learning

21 Materials Activit or Investigation iron filings or nails Investigation : Electric Charges and Forces (Chapter 12), text pages (filings); Activit : Magnetic Fields (Chapter 13) text 473 (filings); Tr This Activit: Magnetic Induction (Chapter 13), text page 476 (nail); Activit : Magnetic Field of a Straight Conductor (Chapter 13), text page 480 (filings); Activit : Magnetic Field of a Coil (Chapter 13), text page 484 (filings); Activit : Constructing a Simple DC Motor (Chapter 13), text pages (nail) lab transformer set (iron core and several coils with Investigation : Transformers (Teacher different numbers of turns) Demonstration) (Chapter 14), text pages light bulb Tr This Activit: AC Generator Demonstration (Chapter 14), text page 520 load (for example, a 25-Ω resistor) Activit : Cells in Series and in Parallel (Chapter 12), text page 448 magnet, bar Tr This Activit: Making a Magnet (Chapter 13), text page 471; Activit : Magnetic Fields (Chapter 13) text 473; Investigation : The Motor Principle (Chapter 13), text pages 492 3; Tr This Activit: A Demonstration of Electromagnetic Induction (Chapter 14), text page 507; Investigation : Inducing Current in a Coiled Conductor (Chapter 14), text pages 508 9; Activit : The Direction of Induced Current (Chapter 14), text pages magnet, horseshoe Investigation : Inducing Current in a Coiled Conductor (Chapter 14), text pages magnet, permanent Tr This Activit: Magnetic Induction (Chapter 13), text page 476; Tr This Activit: Demonstration of Edd Currents (Chapter 14), text page 526 metal rods Activit : Charging b Induction (Chapter 12), text page 429 metal washers or metal paper clips Tr This Activit: Magnetic Induction (Chapter 13), text page 476; Tr This Activit: Testing an Electromagnet (Chapter 13), text page 488 nichrome wire or long finishing nail Investigation : Transformers (Teacher Demonstration) (Chapter 14), text pages paper, small bits of, or sheet Investigation : Electric Charges and Forces (Chapter 12), text pages 425 6; Activit : Magnetic Fields (Chapter 13) text Nelson Thomson Learning Unit 5 Electricit and Magnetism 315

22 Materials Activit or Investigation pencil Activit : Constructing a Simple DC Motor (Chapter 13), text pages pin Activit : Constructing a Simple DC Motor (Chapter 13), text pages pith ball (suspended on thread), or leaf electroscope Investigation : Electric Charges and Forces (Chapter 12), text pages 425 6; Tr This Activit: Charging B Contact (Chapter 12), text page 428; Activit : Charging b Induction (Chapter 12), text page 429 utilit stand, clamp, and metre stick Investigation : The Motor Principle (Chapter 13), text pages ring of metal, hollow dish-shaped with a wooden Investigation : Transformers (Teacher handle Demonstration (Chapter 14), text pages sawdust Investigation : Electric Charges and Forces (Chapter 12), text pages solenoids Investigation : Inducing Current in a Coiled Conductor (Chapter 14), text pages steel paper clips Tr This Activit: Making a Magnet (Chapter 13), text page 471 tape Activit : Constructing a Simple DC Motor (Chapter 13), text pages variac (AC variable voltage power source) Investigation : Transformers (Teacher Demonstration) (Chapter 14), text pages voltmeter, AC multi-range Investigation : Transformers (Teacher Demonstration) (Chapter 14), text pages voltmeter, DC Activit : Cells in Series and in Parallel (Chapter 12), text page 448 Investigation : Transformers (Teacher Demonstration (Chapter 14), text pages wood, block of Activit : Constructing a Simple DC Motor (Chapter 13), text pages Unit 5 Overview 2002 Nelson Thomson Learning