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© 2002 Nelson Thomson Learning Unit 5 Electricity and Magnetism 295

Unit 5 Electricity and Magnetism

Overview In this unit, students explore the properties, quantities, principles, and laws of electricity, magnetic fields, and electromagnetic induction. They carry out experiments or simulations, and build a prototype device, to demonstrate properties of magnetic fields and electromagnetic induction. Also, they identify and describe examples of domestic and industrial technologies that are applications of magnetic fields.

The curriculum emphasis in this unit is technology. This includes the design of a prototype device that applies the principles of electromagnetism (expectation EM2.04), a description of technological systems (expectation EM3.01), and a description of the historical development of technologies (expectation EM3.02).

Chapter 12, Electricity, presents electrostatics and current electricity. Some components of this chapter are a review of the content of the electricity 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, namely 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 always fit into one class period; some need less time, and some need more time. • The key expectations are often covered in more than one way 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 Practice questions are meant for student practice, not for assessment. Some students may reduce the time they spend on

those questions by doing rough solutions rather than formal solutions for evaluation or assessment. (The Section Questions are meant for assessment.)

• As you will notice in the Prerequisite Knowledge and Skills, students in Ontario have been exposed to the topics of electrostatics, current electricity, 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 comfortably complete all parts of all sections of Unit 5 will take approximately 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 introductory 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 your students work on the “Are You Ready?” diagnostic assignment on pages 420–1.

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.

296 Unit 5 Overview © 2002 Nelson Thomson Learning

Table 1 Unit 5 Planning Pathway Topic Period Content Comments, Including Time-Saving Strategies

1 Intro; 12.1 Discuss some of the questions on pages 420–3 orally. Discuss the introduction to section 12.1 briefly. Do Investigation 12.1.1, the Try This Activity, and Activity 12.1.1 as class demonstrations to review what the students learned about electrostatics in grade 9 science. Assign the Section 12.1 Questions for homework.

2 12.2; 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 they can be treated briefly or omitted. Section 12.3 should be emphasized in this period.

3 12.4; 12.5 Electric potential is a compulsory component of the course, so emphasize section 12.4. 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.

4 12.6; 12.7 Although Ohm’s law is not a written requirement in the course expectations, it is needed for the mathematical analysis 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, you can omit the topic on the cost of electricity, pages 463–5.

Ch. 12

5 Review Quiz

Since much of Chapter 12 is a review of the grade 9 unit on electricity, the typical chapter review and test can be replaced with a student-controlled review and self-test. Students can use the Chapter 12 Summary (page 467) and Review (pages 468–9) to complete Chapter 12.

6 Intro; 13.1 Students have not studied magnetism in the science curriculum since grade 3, so they will benefit greatly from activities and demonstrations involving magnetic forces and fields. To ensure ample time for the Try This Activity on page 471 and Activity 13.1.1 on page 473, some questions can be assigned for homework.

7 13.2 This section can be completed fairly easily in one class period. If you haven’t already 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 they will do.

8 13.3; 13.4 start

Since section 13.4 is relatively 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 484.

Ch. 13

9 13.4 finish Complete the parts of section 13.4 not done in the previous period.


Topic Period Content Comments, Including Time-Saving Strategies

10 13.5; 13.6 start

Section 13.5 can easily be done in a single period, but if you intend to have the students build an electric motor (in Activity 13.6.1), you should begin section 13.6 in this period. To save time, Investigation 13.5.1 could be done as a class demonstration.

11 13.6 finish If you intend to have students work on the Unit 5 Performance Task, then the construction of a simple DC motor (Activity 13.6.1) is not mandatory. However, any 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 Study on pages 499–500 can be done fairly quickly, 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 503–5 can be assigned as compulsory and some as optional, and some can be discussed orally.

13 Test After the test, students can begin working on Chapter 14. 14 Intro;

14.1 start The Chapter 14 introduction leads directly to section 14.1. Plan on completing to the end of Investigation 14.1.1 (pages 508–9) in this period.

15 14.1 finish; 14.2

Complete section 14.1, and do section 14.2. To save time, Activity 14.2.1 could be done as a class demonstration.

16 14.3 See the Teaching Suggestions for section 14.3 for ideas on demonstrations and activities to engage the students in this topic.

17 14.4 The planning of this section is straightforward. 18 14.5;

Career Section 14.5 can be combined with the Career feature on page 536.

Ch. 14

19 Review Test

Some items on pages 537–9 can be assigned as compulsory and some as optional, and some can be discussed orally.

Review 20 Unit Review Make a list of questions on pages 542–5 that you 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.


Curriculum and Assessment Map for Unit 5 Overall Expectations

EMV.01 demonstrate an understanding of the properties, physical quantities, principles, and laws related to electricity, magnetic fields, and electromagnetic induction

EMV.02 carry out experiments or simulations, and construct a prototype device, to demonstrate characteristic properties of magnetic fields and electromagnetic induction

EMV.03 identify and describe examples of domestic and industrial technologies that were developed on the basis of the scientific understanding of magnetic fields

Section Overall

Expectations Achievement Chart Categories

Assessment/Evaluation Opportunities (Evidence)

Assessment Tools

.01 .02 .03 Knowledge/ Understanding

Practice questions Understanding Concepts, q. 1–6 EM1.01 Section 12.1 Questions Understanding Concepts, q. 1–7 EM1.01

Rubric 1: Knowledge/Understanding

Inquiry Section 12.1 Questions Applying Inquiry Skills, q. 8–9 EM1.01 Investigation 12.1.1 Analysis a–f, Evaluation g–h EM1.01

Rubric 2: Inquiry Skills

Communication Activity 12.1.1 Try This Activity Section 12.1 Questions Making Connections, q. 11–12 Reflecting, q. 13 EM1.01

Rubric 3: Communication

12.1 Electrostatics •

Making Connections Section 12.1 Questions Making Connections, q. 10–12 EM1.01

Rubric 4: Making Connections


Section Overall

Expectations Achievement Chart Categories


Assessment Tools




Inquiry Section 12.2 Questions Applying Inquiry Skills, q. 8–10 EM1.01 Lab Exercise 12.2.1 Analysis, a–b EM1.01


Communication Section 12.2 Questions Reflecting, q. 11 EM1.01


12.2 Electric Fields and Electric Charge

•

Making Connections Lab Exercise 12.2.1 Analysis, b EM1.01


Knowledge/ Understanding

Practice questions Understanding Concepts, q. 1–5 EM1.01 Section 12.3 Questions Understanding Concepts, q. 1–6 EM1.01, EM1.08


Inquiry Section 12.3 Questions Applying Inquiry Skills, q. 10 EM1.01


Communication Section 12.3 Questions Understanding Concepts, q. 7– 9 Reflecting, q. 12 EM1.01, EM 1.02


12.3 Electric Current

•

Making Connections Section 12.3 Questions Making Connections, q. 11 EM1.01, EM 1.02


12.4 Electric Potential Difference

• Knowledge/ Understanding




Section Overall Expectations

Achievement Chart Categories


Assessment Tools

.01 .02 .03 Inquiry Section 12.4 Questions

Applying Inquiry Skills, q. 11–2 EM1.01


Communication Section 12.4 Questions Understanding Concepts, q. 7 EM1.01


Making Connections Section 12.4 Questions Understanding Concepts, q. 8–10 EM1.01



Practice questions Understanding Concepts, q. 1 EM1.01 Section 12.5 Questions Understanding Concepts, q. 1–6 EM1.01


Inquiry Section 12.5 Questions Applying Inquiry Skills, q. 7 EM1.01 Activity 12.5.1 Analysis, a–b EM1.01




12.5 Kirchhoff’s Laws for Electric Circuits

•

Making Connections Section 12.5 Questions Making Connections, q. 8–9 EM1.01





Inquiry Section 12.6 Questions Applying Inquiry Skills, q. 8–10 EM1.01


Communication Section 12.6 Questions Making Connections, q. 12 EM1.01


12.6 Electric Resistance

• • •

Making Connections Section 12.6 Questions Making Connections, q. 11 EM1.01






Assessment Tools




Inquiry Section 12.7 Questions Applying Inquiry Skills, q. 11 EM1.01


Communication Section 12.7 Questions Making Connections, q. 13 EM1.01


12.7 Power in Electric Circuits

•

Making Connections Section 12.7 Questions Making Connections, q. 12, 14 EM1.01



Practice questions Understanding Concepts, q. 1–2 EM1.01, EM1.03 Section 13.1 Questions Understanding Concepts, q. 1–3 EM1.01, EM1.03


Inquiry Practice questions Applying Inquiry Skills, q. 3–6 EM1.01, EM2.01 Activity 13.1.1 Observations, a–d EM1.01, EM1.03, EM2.01


Communication Section 13.1 Questions Reflecting, q. 6 EM1.01, EM1.03


13.1 Magnetic Force and Fields

• •



13.2 Magnetic Materials

• • Knowledge/ Understanding







Assessment Tools

.01 .02 .03 Inquiry Section 13.2 Questions

Applying Inquiry Skills, q. 4 EM1.03 Try This Activityq. a–b EM1.03


Communication Section 13.2 Questions Understanding Concepts, q. 3 EM1.03







Inquiry Activity 13.3.1 Observations, a–b EM1.04, EM1.05, EM2.02


Communication Section 13.3 Questions Reflecting, q. 4 EMV.03


13.3 Oersted’s Discovery

• • •

Making Connections Activity 13.3.1 Observations, c EM1.04, EM1.05, EM2.02





Inquiry Activity 13.4.1 Observations, a–d EM1.04, EM1.05, EM2.02 Try This Activity EM1.04, EM1.05, EM2.02


Communication Section 13.4 Questions Making Connections, q. 10 EM1.04, EM1.05


13.4 The Magnetic Field of a Coil or Solenoid

• • •

Making Connections Practice questions Making Connections, q. 7 EM1.04, EM1.05 Section 13.4 Questions Making Connections, q. 9 EM1.04, EM1.05






Assessment Tools


Section 13.5 Questions Understanding Concepts, q. 1–2 EM1.04, EM1.05, EM1.06


Inquiry Section 13.5 Questions Applying Inquiry Skills, q. 3–4 EM1.04, EM1.05, EM1.06 Investigation 13.5.1 Analysis, a–e, Evaluation, f EM1.04, EM1.05, EM1.06




13.5 Conductor in a Magnetic Field—The Motor Principle

• •

Making Connections Investigation 13.5.1 Evaluation, g EM1.06





Inquiry Section 13.6 Questions Applying Inquiry Skills, q. 7–8 EM1.06 Activity 13.6.1 Analysis, a–b EM1.06, EM2.04, EM3.01


Communication Section 13.6 Questions Reflecting, q. 10 EM1.06 Explore an Issue EM3.01


13.6 Applications of the Motor Principle

• • •




Practice questions Understanding Concepts, q. 1 EM1.07 Section 14.1 Questions Understanding Concepts, q. 1–6 EM1.07


14.1 Faraday’s Discovery

• •

Inquiry Investigation 14.1.1 Analysis, c–d, f–h EM1.07, EM2.03






Assessment Tools

.01 .02 .03 Communication Investigation 14.1.1

Evaluation, i EM1.07, EM2.03


Making Connections Investigation 14.1.1 Analysis, e EM1.07, EM2.03



Practice questions Understanding Concepts, q. 1–2 EM1.07, EM3.01, EM3.02 Section 14.2 Questions Understanding Concepts, q. 1–4 EM1.07


Inquiry Activity 14.2.1 Analysis, a EM1.07, EM2.03


Communication Activity 14.2.1 Analysis, b EM1.07, EM2.03


14.2 Direction of Induced Current

• • •

Making Connections Practice questions Making Connections, q. 3 EM1.07, EM3.01, EM3.02



Section 14.3 Questions Understanding Concepts, q. 1–4 EM1.07, EM1.08, EM3.01, EM3.02


Inquiry Try This Activity EM1.07, EM1.08


14.3 Electric Generators: AC and DC

• • •

Making Connections Section 14.3 Questions Making Connections, q. 5 EM1.07, EM1.08



Practice questions Understanding Concepts, q. 1–5 EM1.09, EM3.01, EM 3.02 Section 14.4 Questions Understanding Concepts, q. 1–6 EM1.09, EM3.01, EM 3.02


Inquiry Investigation 14.4.1 Analysis, b–f, Evaluation, g–h EM1.09, EM3.01, EM 3.02


Communication Section 14.4 Questions Making Connections, q. 7c EM1.09, EM3.01, EM 3.02


14.4 The Transformer

• • •

Making Connections Section 14.4 Questions Making Connections, q. 7 EM1.09, EM3.01, EM 3.02






Assessment Tools


Practice questions Understanding Concepts, q. 1–3 EM1.08, EM1.09, EM3.01, EM3.02 Section 14.5 Questions Understanding Concepts, q. 1–6 EM1.08, EM1.09, EM3.01, EM3.02


Inquiry Explore an Issue SIS.04


Communication Explore an Issue EM3.01, EM3.02 Career activity Making Connections, q. 1 SIS.12


14.5 Distribution of Electrical Energy

• • •

Making Connections Explore an Issue Section 14.5 Questions Making Connections, q. 7–10 EM1.08, EM1.09, EM3.01, EM3.02


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 theory Grade 9 The Characteristics of Electricity • describe the properties of static electric charges, and explain electrostatic attraction and repulsion using scientific models of

atomic structure • describe charging by contact and by induction • compare qualitatively static electricity and electric current • describe the concepts of electric current, potential difference, and resistance, with the help of a water analogy • 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 energy, 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 quantitatively the percent efficiency of an electrical device that converts electrical energy to other forms of

energy


• describe the relationship among electrical energy transformed, power, and elapsed time, and solve simple problems involving these physical quantities

• compare methods of producing electrical energy, including their advantages and disadvantages • demonstrate knowledge of electrical safety procedures when planning and carrying out an inquiry and choosing and using

materials, tools, and equipment • demonstrate the skills required to plan and conduct an inquiry into electricity, using instruments, tools, and apparatus safely,

accurately, and effectively • 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 by contact and by induction • predict, verify, and explain the effect of a nearby 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 Key Inquiry and Communication Skills As students begin this unit, they 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 14.1.1); for suggestions,

see Appendix A1, page 548–53 • Be able to write lab reports; for suggestions, refer to Appendix A4, pages 560–4. • Be able to apply decision making to issues related to the topics of electricity and electromagnetism; for reference, see

Appendix A2, pages 554–7. • Be proficient in applying math skills such as writing numbers in scientific notation, rounding off answers to the correct

number of significant digits, applying equations to solve problems, using dimensional analysis, and drawing and interpreting graphs; see Appendix A5, pages 565–71.

• Be able to use a variety of resources, including the Internet, to research topics related to electricity and electromagnetism. Key Technical and Safety Skills As students begin this unit, they should • Display wise safety practices when participating in any lab activity; refer to Appendixes B1 and B2 on pages 572–5. • 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 Connections As students progress through this unit, they should • Be capable of recognizing and/or explaining the connections between the science principles presented and the applications

to technology, society, and the environment.

Unit 5 Investigation/Activity/Lab Exercise/Try This Activity Chart and Skills Menu Summary Chapter 12 Investigations, Activities, Lab Exercises, Try This Activities

Completed by Student

Title Purpose Question Prediction/ Hypothesis

Design Materials Procedure Evidence Analysis Evaluation Synthesis

Try This Activity: Safety and Electricity

to test students’ awareness and knowledge of electrical safety

y

Investigation 12.1.1: Electric Charges and Forces

to investigate the laws of electric charge and apply the Bohr-Rutherford model of the atom

y

y

y

y

Try This Activity: Charging by Contact

to investigate how to charge a neutral object by contact

y

y

Activity 12.1.1 Charging by Induction

to investigate how to charge an object by induction

y

y

Lab Exercise 12.2.1: Investigating Data from Millikan’s Oil Drop Experiment

to investigate data similar to values measured by Millikan and look for patterns

y

y

Activity 12.5.1: Cells in Series and in Parallel

to investigate Kirchoff’s voltage law

y

y

Chapter 13 Title Purpose Question Prediction/

Hypothesis Design Materials Procedure Evidence Analysis Evaluation Synthesis

Try This Activity: Making a Magnet

to use a bar magnet to magnetize a steel paper clip

y

y

Activity 13.1.1: Magnetic Fields

to investigate the properties of magnetic fields around bar magnets

y

y

Try This Activity: Magnetic Induction

to investigate the properties of magnetic induction and soft and hard iron

y

y

Activity 13.3.1: Magnetic Field of a Straight Conductor

to investigate the characteristics of the magnetic field around a straight conductor

y

y

Activity 13.4.1: Magnetic Field of a Coil

to investigate the characteristics of the magnetic field around a coil

y

y

Try This Activity: Testing an Electromagnet

to investigate the factors that can affect the strength of an electromagnet

y

y

y

y

y



Investigation 13.5.1: The Motor Principle

to investigate the conditions that cause a current-carrying conductor to experience a force

y

y

y

y

Activity 13.6.1 Constructing a Simple DC Motor

to construct, test, and refine a simple DC motor

y

y

Chapter 14 Title Purpose Question Prediction/


Try This Activity: A Demonstration of Electromagnetic Induction

to investigate and note several instances of electromagnetic induction

y

y

Investigation 14.1.1: Inducing Current in a Coiled Conductor

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

y

y

y

y

Try This Activity: Faraday’s Iron Ring

to investigate the conditions that produce an induced current in the secondary coil of Faraday’s iron ring

y

y



Activity 14.2.1: The Direction of Induced Current

to investigate the direction of the induced current in a coiled conductor

y

y

Try This Activity: AC Generator Demonstration

to investigate the connection between Lenz’s law and the induced current from generators

y

y

y

y

Investigation 14.4.1: Transformers (Teacher Demonstration)

to investigate the relationship between the input and output voltages and the number of windings in the primary and secondary coils

y

y

y

y

Try This Activity: Demonstration of Eddy Currents

to investigate induced eddy currents and the effect on a falling magnet

y

y

y

y

Performance Task Title Purpose Question Prediction/


Technology Trade Show

to allow students to design, create, test, and present a technological device

y

y

y

y

y

y

y


Materials List for Unit 5 Students need the following items to perform the investigations, activities, lab exercises, and Try 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 activity or investigation to obtain appropriate quantities.

Activity or Investigation Text Page Materials Investigation 12.1.1: Electric Charges and Forces (Chapter 12)

425–6 ebonite rods or polyethylene 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

Try This Activity: Charging by Contact (Chapter 12)

428 ebonite rods and fur glass rods and silk pith ball or leaf electroscope

Activity 12.1.1: Charging by Induction (Chapter 12)

429 ebonite rod and fur (or glass rod and silk) two metal rods two glass beakers pith ball or leaf electroscope

Activity 12.5.1: Cells in Series and in Parallel (Chapter 12)

448 voltmeter two or three cells that have the same voltage connecting wires (4) load (for example, a 25-Ω resistor)

Try This Activity: Making a Magnet (Chapter 13)

471 steel paper clips compass bar magnet

Activity 13.1.1: Magnetic Fields (Chapter 13)

473 two bar magnets iron filings sheet of acetate (or paper) small compass

Try This Activity: Magnetic Induction (Chapter 13)

476 permanent magnet iron nail several metal washers

Activity 13.3.1: Magnetic Field of a Straight Conductor (Chapter 13)

480 20 cm of bare 12-gauge copper wire piece of stiff cardboard, 15 cm × 15 cm battery (6 V–12 V) or DC power supply iron filings connecting wires with alligator clips four compasses

Activity 13.4.1: Magnetic Field of a Coil (Chapter 13)

484 50 cm of bare 12-gauge copper wire wooden dowel (about 15 cm long × 4 cm diameter) stiff cardboard and scissors battery (6 V–12 V) or DC power supply connecting wires with alligator clips iron filings 2 compasses


Activity or Investigation Text Page Materials Try This Activity: Testing an Electromagnet (Chapter 13)

488 50 cm of bare 12-gauge copper wire wooden dowel (about 15 cm long × 4 cm diameter) different substances (cylinders) to be placed in core battery (6 V–12 V) or DC power supply connecting wires with alligator clips metal washers or metal paper clips

Investigation 13.5.1: The Motor Principle (Chapter 13)

492–3 insulated wire (fine) retort stand, clamp, and metre stick 5-cm length of bare 12-gauge copper wire pair of bar magnets 6-V battery or DC power supply

Activity 13.6.1: Constructing a Simple DC Motor (Chapter 13)

498–9 insulated wire tape pencil pin 2 common iron nails (about 7 cm long) 6-V battery, or DC power supply block of wood cardboard

Try This Activity: A Demonstration of Electromagnetic Induction (Chapter 14)

507 soft iron core coil bar magnet galvanometer or milliammeter

Investigation 14.1.1: Inducing Current in a Coiled Conductor (Chapter 14)

508–9 connecting wires galvanometer or ammeter horseshoe magnet coil with a hollow core pair of bar magnets two similar solenoids of 300 and 600 turns

Try This Activity: Faraday’s Iron Ring (Chapter 14)

510 Faraday’s iron ring apparatus DC power supply (battery) galvanometer or ammeter

Activity 14.2.1: The Direction of Induced Current (Chapter 14)

513–4 coiled conductor galvanometer or ammeter magnet connecting wires

Try This Activity: AC Generator Demonstration (Chapter 14)

520 generator (hand crank) connecting wires (if needed) small light bulb

Investigation 14.4.1: Transformers (Teacher Demonstration) (Chapter 14)

523–5 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 battery DC voltmeter nichrome wire or long finishing nail water hollow dish-shaped ring of metal with wooden handle

Try This Activity: Demonstration of Eddy Currents (Chapter 14)

526 long copper tube two similar cylindrical pieces of metal (strong magnet, unmagnetized)


Materials Activity or Investigation battery (6 V or 12 V) or DC power supply Activity 13.3.1: Magnetic Field of a Straight

Conductor (Chapter 13), text page 480; Activity 13.4.1: Magnetic Field of a Coil (Chapter 13), text page 484; Try This Activity: Testing an Electromagnet (Chapter 13), text page 488; Investigation 13.5.1: The Motor Principle (Chapter 13), text pages 492–3; Activity 13.6.1: Constructing a Simple DC Motor (Chapter 13), text pages 498–9; Try This Activity: Faraday’s Iron Ring (Chapter 14), text page 510; Investigation 14.4.1: Transformers (Teacher Demonstration) (Chapter 14), text pages 523–5

cardboard, stiff (and scissors) Activity 13.3.1: Magnetic Field of a Straight Conductor (Chapter 13), text page 480; Activity 13.4.1: Magnetic Field of a Coil (Chapter 13), text page 484; Activity 13.6.1: Constructing a Simple DC Motor (Chapter 13), text pages 498–9

cells, two or three that have the same voltage Activity 12.5.1: Cells in Series and in Parallel (Chapter 12), text page 448

coil (with a hollow core) Try This Activity: A Demonstration of Electromagnetic Induction (Chapter 14), text page 507; Investigation 14.1.1: Inducing Current in a Coiled Conductor (Chapter 14), text pages 508–9

coiled conductor Activity 14.2.1: The Direction of Induced Current (Chapter 14), text pages 513–4

compass Try This Activity: Making a Magnet (Chapter 13), text page 471; Activity 13.1.1: Magnetic Fields (Chapter 13) text 473; Activity 13.3.1: Magnetic Field of a Straight Conductor (Chapter 13), text page 480; Activity 13.4.1: Magnetic Field of a Coil (Chapter 13), text page 484

connecting wires (with alligator clips) Activity 12.5.1: Cells in Series and in Parallel (Chapter 12), text page 448; Activity 13.3.1: Magnetic Field of a Straight Conductor (Chapter 13), text page 480; Activity 13.4.1: Magnetic Field of a Coil (Chapter 13), text page 484; Try This Activity: Testing an Electromagnet (Chapter 13), text page 488; Investigation 14.1.1: Inducing Current in a Coiled Conductor (Chapter 14), text pages 508–9; Activity 14.2.1: The Direction of Induced Current (Chapter 14), text pages 513–4; Try This Activity: AC Generator Demonstration (Chapter 14), text page 520


Materials Activity or Investigation copper tube Try This Activity: Demonstration of Eddy

Currents (Chapter 14), text page 526 copper wire, bare 12-gauge Activity 13.3.1: Magnetic Field of a Straight

Conductor (Chapter 13), text page 480; Activity 13.4.1: Magnetic Field of a Coil (Chapter 13), text page 484; Try This Activity: Testing an Electromagnet (Chapter 13), text page 488; Investigation 13.5.1: The Motor Principle (Chapter 13), text pages 492–3

different substances (cylinders) to be placed in core Try This Activity: Testing an Electromagnet (Chapter 13), text page 488

dowel, wooden (15 cm long × 4 cm diameter) Activity 13.4.1: Magnetic Field of a Coil (Chapter 13), text page 484; Try This Activity: Testing an Electromagnet (Chapter 13), text page 488

ebonite rods or polyethylene strips and fur Investigation 12.1.1: Electric Charges and Forces (Chapter 12), text pages 425–6; Try This Activity: Charging by Contact (Chapter 12), text page 428; Activity 12.1.1: Charging by Induction (Chapter 12), text page 429

Faraday’s iron ring apparatus Try This Activity: Faraday’s Iron Ring (Chapter 14), text page 510

galvanometer or milliammeter Try This Activity: A Demonstration of Electromagnetic Induction (Chapter 14), text page 507; Investigation 14.1.1: Inducing Current in a Coiled Conductor (Chapter 14), text pages 508–9 (or ammeter); Try This Activity: Faraday’s Iron Ring (Chapter 14), text page 510 (or ammeter); Activity 14.2.1: The Direction of Induced Current (Chapter 14), text pages 513–4 (or ammeter),

generator (hand crank) and small light bulb Try This Activity: AC Generator Demonstration (Chapter 14), text page 520

glass beakers Activity 12.1.1: Charging by Induction (Chapter 12), text page 429

glass rods or acetate strips and silk Investigation 12.1.1: Electric Charges and Forces (Chapter 12), text pages 425–6; Try This Activity: Charging by Contact (Chapter 12), text page 428

insulated rod hanger Investigation 12.1.1: Electric Charges and Forces (Chapter 12), text pages 425–6

insulated wire (fine) Investigation 13.5.1: The Motor Principle (Chapter 13), text pages 492–3; Activity 13.6.1: Constructing a Simple DC Motor (Chapter 13), text pages 498–9

iron core, soft Try This Activity: A Demonstration of Electromagnetic Induction (Chapter 14), text page 507


Materials Activity or Investigation iron filings or nails Investigation 12.1.1: Electric Charges and Forces

(Chapter 12), text pages 425–6 (filings); Activity 13.1.1: Magnetic Fields (Chapter 13) text 473 (filings); Try This Activity: Magnetic Induction (Chapter 13), text page 476 (nail); Activity 13.3.1: Magnetic Field of a Straight Conductor (Chapter 13), text page 480 (filings); Activity 13.4.1: Magnetic Field of a Coil (Chapter 13), text page 484 (filings); Activity 13.6.1: Constructing a Simple DC Motor (Chapter 13), text pages 498–9 (nail)

lab transformer set (iron core and several coils with different numbers of turns)

Investigation 14.4.1: Transformers (Teacher Demonstration) (Chapter 14), text pages 523–5

light bulb Try This Activity: AC Generator Demonstration (Chapter 14), text page 520

load (for example, a 25-Ω resistor) Activity 12.5.1: Cells in Series and in Parallel (Chapter 12), text page 448

magnet, bar Try This Activity: Making a Magnet (Chapter 13), text page 471; Activity 13.1.1: Magnetic Fields (Chapter 13) text 473; Investigation 13.5.1: The Motor Principle (Chapter 13), text pages 492–3; Try This Activity: A Demonstration of Electromagnetic Induction (Chapter 14), text page 507; Investigation 14.1.1: Inducing Current in a Coiled Conductor (Chapter 14), text pages 508–9; Activity 14.2.1: The Direction of Induced Current (Chapter 14), text pages 513–4

magnet, horseshoe Investigation 14.1.1: Inducing Current in a Coiled Conductor (Chapter 14), text pages 508–9

magnet, permanent Try This Activity: Magnetic Induction (Chapter 13), text page 476; Try This Activity: Demonstration of Eddy Currents (Chapter 14), text page 526

metal rods Activity 12.1.1: Charging by Induction (Chapter 12), text page 429

metal washers or metal paper clips Try This Activity: Magnetic Induction (Chapter 13), text page 476; Try This Activity: Testing an Electromagnet (Chapter 13), text page 488

nichrome wire or long finishing nail Investigation 14.4.1: Transformers (Teacher Demonstration) (Chapter 14), text pages 523–5

paper, small bits of, or sheet Investigation 12.1.1: Electric Charges and Forces (Chapter 12), text pages 425–6; Activity 13.1.1: Magnetic Fields (Chapter 13) text 473


Materials Activity or Investigation pencil Activity 13.6.1: Constructing a Simple DC Motor

(Chapter 13), text pages 498–9 pin Activity 13.6.1: Constructing a Simple DC Motor

(Chapter 13), text pages 498–9 pith ball (suspended on thread), or leaf electroscope Investigation 12.1.1: Electric Charges and Forces

(Chapter 12), text pages 425–6; Try This Activity: Charging By Contact (Chapter 12), text page 428; Activity 12.1.1: Charging by Induction (Chapter 12), text page 429

utility stand, clamp, and metre stick Investigation 13.5.1: The Motor Principle (Chapter 13), text pages 492–3

ring of metal, hollow dish-shaped with a wooden handle

Investigation 14.4.1: Transformers (Teacher Demonstration (Chapter 14), text pages 523–5

sawdust Investigation 12.1.1: Electric Charges and Forces (Chapter 12), text pages 425–6

solenoids Investigation 14.1.1: Inducing Current in a Coiled Conductor (Chapter 14), text pages 508–9

steel paper clips Try This Activity: Making a Magnet (Chapter 13), text page 471

tape Activity 13.6.1: Constructing a Simple DC Motor (Chapter 13), text pages 498–9

variac (AC variable voltage power source) Investigation 14.4.1: Transformers (Teacher Demonstration) (Chapter 14), text pages 523–5

voltmeter, AC multi-range Investigation 14.4.1: Transformers (Teacher Demonstration) (Chapter 14), text pages 523–5

voltmeter, DC Activity 12.5.1: Cells in Series and in Parallel (Chapter 12), text page 448 Investigation 14.4.1: Transformers (Teacher Demonstration (Chapter 14), text pages 523–5

wood, block of Activity 13.6.1: Constructing a Simple DC Motor (Chapter 13), text pages 498–9

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