The science of electrical engineering is unique in that almost everything we work with does not allow for direct observation. It is much like the

Size: px
Start display at page:

Download "The science of electrical engineering is unique in that almost everything we work with does not allow for direct observation. It is much like the"

Transcription

1 1

2 The science of electrical engineering is unique in that almost everything we work with does not allow for direct observation. It is much like the allegory of Plato s cave, where a group of prisoners has, since infancy, been shackled to the floor of a cave. The only light in the cave comes from a fire behind the prisoners. In addition, there is a roadway between the prisoners and the light where puppet showmen perform. The prisoners observe the antics of the puppet showmen by looking at the shadows they make on the wall in front of them they are not able to directly see the puppets. Eventually, the prisoners create a world where they name the shadows, and believe they know what they look like. Philosophers, Plato opined, are people who have been freed from the chains and are more able to directly observe the puppets in other words, reality. Plato (channeling Socrates) in fact used this allegory to emphasize the importance of education. We are using it here a little differently through education and application of all the things that you will learn physics, math and chemistry you will be able to observe these shadows, if not directly, at least with a good understanding of how they will operate under certain conditions and how you will design your systems to operate in the way that you need them to operate. 2

3 Some of the phenomena electrical and computer engineers need to observe are the existence and motion of electrons and protons; these create electric fields, magnetic fields, or in the case of alternating fields, electromagnetic fields. We also need to be able to observe the response of different materials to these fields. These are all phenomena that are not directly observed however, they are related to forces and motion that can be more directly observed. What we actually observe or measure are the magnitude of a current through a wire (for example), the magnitude and polarity of a voltage between two points (this is directly related to the electric field), the resistance, inductance or capacitance of a component, and the reaction of different components to the existence of a constant or time-varying voltage or current at their terminals. 3

4 For constant fields, we use an ammeter for current, a voltmeter for voltage and an Ohmmeter for resistance. For time-varying fields, we will use in this class an oscilloscope, but in more advanced classes you will also learn how to use spectrum, network and signal analyzers. In lab, you will have to learn how to operate dc power supplies and signal generators to generate the voltages and currents you need to be able to observe the response of your circuit. 4

5 Charge is quantized that is, it is expressed in terms of its smallest value, which is e. 5

6 This is a perfect example of using a directly observable quantity force to describe a phenomenon that is not directly observable the electric field. The attractive or repelling force is directly related to the electric field of each charge. 6

7 Charge is never static it always moves due to thermal motion; however, this motion is random and generally does not lead to measurable current. 7

8 In order for there to be current, conditions must exist so that charge moves from one point to another in a direct line. 8

9 Current expresses the rate of flow of charged particles; the unit of current is 1A; 1A is equivalent to one Coulomb of charge going through a surface area per second. 9

10 In order to measure current, we need to break its path and insert an ammeter in such a way so that the current flows through the ammeter. 10

11 While it is easier to directly observe the force between two particles, it is important to understand that this force is due to the electric field that exists around each particle. If, then, we remove one of the charges in the first schematic above and look only at each charge individually, we can define a vector known as the electric field. The field has the potential to exert a force on another charge, if that charge finds itself in the vicinity of the first charge. 11

12 We build up electric field by distributing charge in such a way as to have a surplus of positive charge on one side and an equivalent deficit of positive charge (or surplus of negative charge) on the other side of a component. The components depicted here are a capacitor and a resistive element. A perfect conductor is not able to develop these charge distributions, so the electric field inside a conductor is zero. However, as in the case of the capacitor, two conductors that are not electrically connected can exhibit a potential difference, so an electric field can exist between the two. This is called a capacitor, and the electric field is measured as a voltage difference between the terminals of a capacitor. In the case of a resistor, what happens is that while charge flows through the resistor, it does not flow unimpeded. Thus, and imbalance in the distribution of charge is developed along the length of the resistor, thus creating a voltage drop in the direction of the current. It is the electric field (voltage) at the terminals of the resistor that provides the force that propels the charge, thus creating the conditions for establishing a current. 12

13 13

14 A magnetic force, on the other hand, is exerted on a moving particle when it travels through a magnetic field. Well, not always. If the charged particle is moving parallel to the magnetic field lines, no force will be exerted on it. If perpendicular, a maximum force will be exerted and it will be equalt to the charge times the velocity times the magnitude of the electric field. The force will be perpendicular to the surface described by the velocity vector and the magnetic field vector. 14

15 What is current? It is moving charge. So, if I place a flexible line of current perpendicular to a uniform magnetic field, then the line of current will bend in the direction of the resulting force. In order to determine the direction of the force, we use the FBI rule. Using your left hand, align the middle finger with I, the forefinger with B and then the thumb will naturally point in the direction of F. Try this with figures (b) and (c) above. The circle with the + or x in the middle means the field is going IN to the paper, while if the circles had a dot in the middle, the field would be pointing outward. 15

16 One application which we will observe in the lab is the electric motor. In fact, in the case of this versatile device, the same configuration can give us the motor where we drive current through the wire which interacts with the magnetic field, resulting in a force that rotates the motor. It can also give us the generator where we use mechanical means to rotate the coil inside a magnetic field. The changing magnetic flux through the surface of the coil will result in 16

17 In lab, you will construct a basic motor and a coil gun. 17

Answer Key. Chapter 23. c. What is the current through each resistor?

Answer Key. Chapter 23. c. What is the current through each resistor? Chapter 23. Three 2.0- resistors are connected in series to a 50.0- power source. a. What is the equivalent resistance of the circuit? R R R 2 R 3 2.0 2.0 2.0 36.0 b. What is the current in the circuit?

More information

MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.

MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. Practice Exam 4 Sci1600 S18 Name MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) Two particles with the electric charges Q1 and Q2 repel each other.

More information

MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.

MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. Practice Exam 4 Sci1600 S18 KEY Name MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) Two particles with the electric charges Q1 and Q2 repel each

More information

Electromagnetism Review Sheet

Electromagnetism Review Sheet Electromagnetism Review Sheet Electricity Atomic basics: Particle name Charge location protons electrons neutrons + in the nucleus - outside of the nucleus neutral in the nucleus What would happen if two

More information

Mansfield Independent School District AP Physics C: Electricity and Magnetism Year at a Glance

Mansfield Independent School District AP Physics C: Electricity and Magnetism Year at a Glance Mansfield Independent School District AP Physics C: Electricity and Magnetism Year at a Glance First Six-Weeks Second Six-Weeks Third Six-Weeks Lab safety Lab practices and ethical practices Math and Calculus

More information

AP Physics C. Magnetism - Term 4

AP Physics C. Magnetism - Term 4 AP Physics C Magnetism - Term 4 Interest Packet Term Introduction: AP Physics has been specifically designed to build on physics knowledge previously acquired for a more in depth understanding of the world

More information

Physics 112. Study Notes for Exam II

Physics 112. Study Notes for Exam II Chapter 20 Electric Forces and Fields Physics 112 Study Notes for Exam II 4. Electric Field Fields of + and point charges 5. Both fields and forces obey (vector) superposition Example 20.5; Figure 20.29

More information

Current in a Magnetic Field Learning Outcomes. Force on a Current-Carrying Conductor

Current in a Magnetic Field Learning Outcomes. Force on a Current-Carrying Conductor 1 Current in a Magnetic Field Learning Outcomes Discuss the force on a current-carrying conductor in a magnetic field. Demonstrate this force. Solve problems about this force. Discuss applications of this

More information

Ch 17 Problem Set 31. A toaster is rated at 600 W when connected to a 120-V source. What current does the toaster carry, and what is its resistance?

Ch 17 Problem Set 31. A toaster is rated at 600 W when connected to a 120-V source. What current does the toaster carry, and what is its resistance? Ch 17 Problem Set 31. A toaster is rated at 600 W when connected to a 120-V source. What current does the toaster carry, and what is its resistance? 33. How many 100-W lightbulbs can you use in a 120-V

More information

Outline of College Physics OpenStax Book

Outline of College Physics OpenStax Book Outline of College Physics OpenStax Book Taken from the online version of the book Dec. 27, 2017 18. Electric Charge and Electric Field 18.1. Static Electricity and Charge: Conservation of Charge Define

More information

PHYSICS 3204 PUBLIC EXAM QUESTIONS (Magnetism &Electromagnetism)

PHYSICS 3204 PUBLIC EXAM QUESTIONS (Magnetism &Electromagnetism) PHYSICS 3204 PUBLIC EXAM QUESTIONS (Magnetism &Electromagnetism) NAME: August 2009---------------------------------------------------------------------------------------------------------------------------------

More information

Calculus Relationships in AP Physics C: Electricity and Magnetism

Calculus Relationships in AP Physics C: Electricity and Magnetism C: Electricity This chapter focuses on some of the quantitative skills that are important in your C: Mechanics course. These are not all of the skills that you will learn, practice, and apply during the

More information

COLLEGE PHYSICS Chapter 23 ELECTROMAGNETIC INDUCTION, AC CIRCUITS, AND ELECTRICAL TECHNOLOGIES

COLLEGE PHYSICS Chapter 23 ELECTROMAGNETIC INDUCTION, AC CIRCUITS, AND ELECTRICAL TECHNOLOGIES COLLEGE PHYSICS Chapter 23 ELECTROMAGNETIC INDUCTION, AC CIRCUITS, AND ELECTRICAL TECHNOLOGIES Induced emf: Faraday s Law and Lenz s Law We observe that, when a magnet is moved near a conducting loop,

More information

Electron Theory of Charge. Electricity. 1. Matter is made of atoms. Refers to the generation of or the possession of electric charge.

Electron Theory of Charge. Electricity. 1. Matter is made of atoms. Refers to the generation of or the possession of electric charge. Electricity Refers to the generation of or the possession of electric charge. There are two kinds of electricity: 1. Static Electricity the electric charges are "still" or static 2. Current Electricity

More information

Direct Current (DC) Circuits

Direct Current (DC) Circuits Direct Current (DC) Circuits NOTE: There are short answer analysis questions in the Participation section the informal lab report. emember to include these answers in your lab notebook as they will be

More information

1. A solenoid is a powerful magnet that is created by looping a conductor and passing a current through the conductor.

1. A solenoid is a powerful magnet that is created by looping a conductor and passing a current through the conductor. Electricity and Magnetism Unit Test /60 Part A: True/False [5 K/U] In the blank provided, identify if the statement is true or false. If the statement is false, identify and correct the portion that is

More information

Physics 2B: Review for Celebration #2. Chapter 22: Current and Resistance

Physics 2B: Review for Celebration #2. Chapter 22: Current and Resistance Physics 2: eview for Celebration #2 Chapter 22: Current and esistance Current: q Current: I [I] amps (A) 1 A 1 C/s t Current flows because a potential difference across a conductor creates an electric

More information

AP Physics C. Electricity - Term 3

AP Physics C. Electricity - Term 3 AP Physics C Electricity - Term 3 Interest Packet Term Introduction: AP Physics has been specifically designed to build on physics knowledge previously acquired for a more in depth understanding of the

More information

Electromagnetism Notes 1 Magnetic Fields

Electromagnetism Notes 1 Magnetic Fields Electromagnetism Notes 1 Magnetic Fields Magnets can or other magnets. They are able to exert forces on each other without touching because they are surrounded by. Magnetic Flux refers to Areas with many

More information

DO PHYSICS ONLINE MOTORS AND GENERATORS FARADAY S LAW ELECTROMAGNETIC INDUCTION

DO PHYSICS ONLINE MOTORS AND GENERATORS FARADAY S LAW ELECTROMAGNETIC INDUCTION DO PHYSICS ONLINE MOTORS AND GENERATORS FARADAY S LAW ELECTROMAGNETIC INDUCTION English Michael Faraday (1791 1867) who experimented with electric and magnetic phenomena discovered that a changing magnetic

More information

Winmeen Tnpsc Group 1 & 2 Study Materials

Winmeen Tnpsc Group 1 & 2 Study Materials 17. Magnetic Effect of Electric Current and Light 1. Give detail on Oersted? Name : Oersted Born : 14th August 1777 Birth place : Langeland Denmark Died : 9th March 1851 Best known for : The study of electromagnetism

More information

Read Chapter 7; pages:

Read Chapter 7; pages: Forces Read Chapter 7; pages: 191-221 Objectives: - Describe how electrical charges exert forces on each other; Compare the strengths of electric and gravitational forces; Distinguish between conductors

More information

Physics 6B Summer 2007 Final

Physics 6B Summer 2007 Final Physics 6B Summer 2007 Final Question 1 An electron passes through two rectangular regions that contain uniform magnetic fields, B 1 and B 2. The field B 1 is stronger than the field B 2. Each field fills

More information

Saint Lucie County Science Scope and Sequence

Saint Lucie County Science Scope and Sequence Course: Honors Physics 1 Course Code: 2003390 UNIT 9 TOPIC of STUDY: Electricity STANDARDS: 10: Energy ~The electric force between two charged particles depends upon the size of the charge and the distance

More information

Dynamic Electricity. All you need to be an inventor is a good imagination and a pile of junk. -Thomas Edison

Dynamic Electricity. All you need to be an inventor is a good imagination and a pile of junk. -Thomas Edison Dynamic Electricity All you need to be an inventor is a good imagination and a pile of junk. -Thomas Edison Review Everything is made of atoms which contain POSITIVE particles called PROTONS and NEGATIVE

More information

Part 4: Electricity & Magnetism

Part 4: Electricity & Magnetism Part 4: Electricity & Magnetism Notes: Magnetism Magnetism Magnets: 1.Have a north and south pole 2.Like poles repel; opposite poles attract - The larger the distance between the magnets, the weaker the

More information

Electricity. Part 1: Static Electricity

Electricity. Part 1: Static Electricity Electricity Part 1: Static Electricity Introduction: Atoms Atoms are made up of charged particles. Atoms are made of 3 subatomic particles: Electrons protons, electrons and neutrons. Protons () Charge

More information

Physics for Scientists and Engineers 4th Edition 2017

Physics for Scientists and Engineers 4th Edition 2017 A Correlation and Narrative Summary of Physics for Scientists and Engineers 4th Edition 2017 To the AP Physics C: Electricity and Magnetism Course Description AP is a trademark registered and/or owned

More information

Magnetism. a) Ferromagnetic materials are strongly attracted to magnets. b) Paramagnetic materials are weakly attracted to magnets

Magnetism. a) Ferromagnetic materials are strongly attracted to magnets. b) Paramagnetic materials are weakly attracted to magnets Magnetism Types of Magnetic Materials Magnetic substances can be classified into three basic groups, according to their response to a magnet. Note the strength and direction of the interaction. a) Ferromagnetic

More information

The Digital Multimeter (DMM)

The Digital Multimeter (DMM) The Digital Multimeter (DMM) Since Physics 152 covers electricity and magnetism, the analysis of both DC and AC circuits is required. In the lab, you will need to measure resistance, potential (voltage),

More information

Physics 17 Part M Dr. Alward

Physics 17 Part M Dr. Alward Physics 17 Part M Dr. Alward Elementary Facts Concerning Magnets Magnets have north and south poles. Like Poles Repel Unlike Poles Attract Magnetic Dipoles Magnets have two poles, one north, the other

More information

21 MAGNETIC FORCES AND MAGNETIC FIELDS

21 MAGNETIC FORCES AND MAGNETIC FIELDS CHAPTER 1 MAGNETIC FORCES AND MAGNETIC FIELDS ANSWERS TO FOCUS ON CONCEPTS QUESTIONS 1 (d) Right-Hand Rule No 1 gives the direction of the magnetic force as x for both drawings A and B In drawing C, the

More information

Most matter is electrically neutral; its atoms and molecules have the same number of electrons as protons.

Most matter is electrically neutral; its atoms and molecules have the same number of electrons as protons. Magnetism Electricity Magnetism Magnetic fields are produced by the intrinsic magnetic moments of elementary particles associated with a fundamental quantum property, their spin. -> permanent magnets Magnetic

More information

Magnetism. and its applications

Magnetism. and its applications Magnetism and its applications Laws of Magnetism 1) Like magnetic poles repel, and 2) unlike poles attract. Magnetic Direction and Strength Law 3 - Magnetic force, either attractive or repelling varies

More information

ELECTRICITY AND MAGNETISM, A. C. THEORY AND ELECTRONICS, ATOMIC AND NUCLEAR PHYSICS

ELECTRICITY AND MAGNETISM, A. C. THEORY AND ELECTRONICS, ATOMIC AND NUCLEAR PHYSICS UNIT 2: ELECTRICITY AND MAGNETISM, A. C. THEORY AND ELECTRONICS, ATOMIC AND NUCLEAR PHYSICS MODULE 1: ELECTRICITY AND MAGNETISM GENERAL OBJECTIVES On completion of this Module, students should: 1. understand

More information

NCERT solutions Magnetic effects of current (In-text questions)

NCERT solutions Magnetic effects of current (In-text questions) NCERT solutions Magnetic effects of current (In-text questions) Page No: 224 Question 1 Why does a compass needle get deflected when brought near a bar magnet? Compass needle is a small permanent magnet.

More information

PHY 131 Review Session Fall 2015 PART 1:

PHY 131 Review Session Fall 2015 PART 1: PHY 131 Review Session Fall 2015 PART 1: 1. Consider the electric field from a point charge. As you move farther away from the point charge, the electric field decreases at a rate of 1/r 2 with r being

More information

Physics Will Farmer. May 5, Physics 1120 Contents 2

Physics Will Farmer. May 5, Physics 1120 Contents 2 Physics 1120 Will Farmer May 5, 2013 Contents Physics 1120 Contents 2 1 Charges 3 1.1 Terms................................................... 3 1.2 Electric Charge..............................................

More information

OAKTON COMMUNITY COLLEGE COURSE SYLLABUS. I. Course Course Course Prefix Number Name Credit: Lecture Lab. PHY 132 College Physics II 4 3 2

OAKTON COMMUNITY COLLEGE COURSE SYLLABUS. I. Course Course Course Prefix Number Name Credit: Lecture Lab. PHY 132 College Physics II 4 3 2 OAKTON COMMUNITY COLLEGE COURSE SYLLABUS I. Course Course Course Prefix Number Name Credit: Lecture Lab PHY 132 College Physics II 4 3 2 II. Prerequisites: PHY 131 III. Course (catalog) Description: Course

More information

Welcome back to PHY101: Major Concepts in Physics I. Photo: J. M. Schwarz

Welcome back to PHY101: Major Concepts in Physics I. Photo: J. M. Schwarz Welcome back to PHY101: Major Concepts in Physics I Photo: J. M. Schwarz Announcements In class today we will finish Chapter 18 on circuits and begin Chapter 19 (sections 1 and 8) on magnetic fields. There

More information

> What happens when the poles of two magnets are brought close together? > Two like poles repel each other. Two unlike poles attract each other.

> What happens when the poles of two magnets are brought close together? > Two like poles repel each other. Two unlike poles attract each other. CHAPTER OUTLINE Section 1 Magnets and Magnetic Fields Key Idea questions > What happens when the poles of two magnets are brought close together? > What causes a magnet to attract or repel another magnet?

More information

1. An isolated stationary point charge produces around it. a) An electric field only. b) A magnetic field only. c) Electric as well magnetic fields.

1. An isolated stationary point charge produces around it. a) An electric field only. b) A magnetic field only. c) Electric as well magnetic fields. 1. An isolated stationary point charge produces around it. a) An electric field only. b) A magnetic field only. c) Electric as well magnetic fields. 2. An isolated moving point charge produces around it.

More information

CHARGE AND ELECTRIC CURRENT:

CHARGE AND ELECTRIC CURRENT: ELECTRICITY: CHARGE AND ELECTRIC CURRENT ELECTRIC CHARGE ELECTRIC CURRENT ELECTRIC CIRCUIT DEFINITION AND COMPONENTS EFFECTS OF ELECTRIC CURRENT TYPES OF CIRCUITS ELECTRIC QUANTITIES VOLTAGE CURRENT RESISTANCE

More information

Lesson Plan: Electric Circuits (~130 minutes) Concepts

Lesson Plan: Electric Circuits (~130 minutes) Concepts Lesson Plan: Electric Circuits (~130 minutes) Concepts 1. Electricity is the flow of electric charge (electrons). 2. Electric Charge is a property of subatomic particles. 3. Current is the movement of

More information

Northern Regional: January 19 th, Circuit Lab B Test. Name(s): Team Name: School Name: Rank: Team Number: Score:

Northern Regional: January 19 th, Circuit Lab B Test. Name(s): Team Name: School Name: Rank: Team Number: Score: Northern Regional: January 19 th, 2019 Circuit Lab B Test Name(s): Team Name: School Name: Team Number: Rank: Score: Circuits Lab B Test Instructions: Each team has 50 minutes to complete this test. This

More information

Section 11: Magnetic Fields and Induction (Faraday's Discovery)

Section 11: Magnetic Fields and Induction (Faraday's Discovery) Section 11: Magnetic Fields and Induction (Faraday's Discovery) In this lesson you will describe Faraday's law of electromagnetic induction and tell how it complements Oersted's Principle express an understanding

More information

PHY 102: Notes. FBDs and Buoyancy: How does one solve problems?

PHY 102: Notes. FBDs and Buoyancy: How does one solve problems? PHY 102: Notes Chapter 9: Solids and Fluids (sections 3-7) 1. Density Difference between mass and weight density 2. Pressure:General Definition P = Read tip 9.1 pg 211 and summarize: 3. Pressure in a fluid

More information

Electromagnetism Checklist

Electromagnetism Checklist Electromagnetism Checklist Elementary Charge and Conservation of Charge 4.1.1A Convert from elementary charge to charge in coulombs What is the charge in coulombs on an object with an elementary charge

More information

Physics 212 Midterm 2 Form A

Physics 212 Midterm 2 Form A 1. A wire contains a steady current of 2 A. The charge that passes a cross section in 2 s is: A. 3.2 10-19 C B. 6.4 10-19 C C. 1 C D. 2 C E. 4 C 2. In a Physics 212 lab, Jane measures the current versus

More information

Section 11: Magnetic Fields and Induction (Faraday's Discovery)

Section 11: Magnetic Fields and Induction (Faraday's Discovery) Section 11: Magnetic Fields and Induction (Faraday's Discovery) In this lesson you will describe Faraday's law of electromagnetic induction and tell how it complements Oersted's Principle express an understanding

More information

Name: Class: Date: AP Physics Spring 2012 Q6 Practice. Multiple Choice Identify the choice that best completes the statement or answers the question.

Name: Class: Date: AP Physics Spring 2012 Q6 Practice. Multiple Choice Identify the choice that best completes the statement or answers the question. ame: Class: Date: ID: A AP Physics Spring 2012 Q6 Practice Multiple Choice Identify the choice that best completes the statement or answers the question. 1. (2 points) A potential difference of 115 V across

More information

Electric Charge. Conductors A material that transfers charge easily Metals

Electric Charge. Conductors A material that transfers charge easily Metals Electric Charge An electrical property of matter that creates a force between objects. Like charges repel Opposite charges attract Equal amount of positive and negative = no net charge Electrons: Negative

More information

1. Write the relation for the force acting on a charge carrier q moving with velocity through a magnetic field in vector notation. Using this relation, deduce the conditions under which this force will

More information

Name: Block: Date: NNHS Introductory Physics: MCAS Review Packet #4 Introductory Physics, High School Learning Standards for a Full First-Year Course

Name: Block: Date: NNHS Introductory Physics: MCAS Review Packet #4 Introductory Physics, High School Learning Standards for a Full First-Year Course Introductory Physics, High School Learning Standards for a Full First-Year Course I. C ONTENT S TANDARDS electricity and magnetism. 5.1 Recognize that an electric charge tends to be static on insulators

More information

Electricity and Light Pre Lab Questions

Electricity and Light Pre Lab Questions Electricity and Light Pre Lab Questions The pre lab questions can be answered by reading the theory and procedure for the related lab. You are strongly encouraged to answers these questions on your own.

More information

Electricity. Prepared by Juan Blázquez, Alissa Gildemann. Electric charge is a property of all objects. It is responsible for electrical phenomena.

Electricity. Prepared by Juan Blázquez, Alissa Gildemann. Electric charge is a property of all objects. It is responsible for electrical phenomena. Unit 11 Electricity 1. Electric charge Electric charge is a property of all objects. It is responsible for electrical phenomena. Electrical phenomena are caused by the forces of attraction and repulsion.

More information

EXEMPLAR NATIONAL CERTIFICATE (VOCATIONAL) ELECTRICAL PRINCIPLES AND PRACTICE NQF LEVEL 3 ( ) (X-Paper) 09:00 12:00

EXEMPLAR NATIONAL CERTIFICATE (VOCATIONAL) ELECTRICAL PRINCIPLES AND PRACTICE NQF LEVEL 3 ( ) (X-Paper) 09:00 12:00 NATIONAL CERTIFICATE (VOCATIONAL) ELECTRICAL PRINCIPLES AND PRACTICE NQF LEVEL 3 2008 (12041002) (X-Paper) 09:00 12:00 EXEMPLAR This question paper consists of 7 pages. EXEMPLAR -2- NC(V) TIME: 3 HOURS

More information

ELECTRICITY UNIT REVIEW

ELECTRICITY UNIT REVIEW ELECTRICITY UNIT REVIEW S1-3-04: How does the Atomic Model help to explain static electricity? 1. Which best describes static electricity? a) charges that can be collected and held in one place b) charges

More information

Lab 7: Magnetism Introduction Magnets need no introduction (i.e. introduction to be added in future revision).

Lab 7: Magnetism Introduction Magnets need no introduction (i.e. introduction to be added in future revision). CSUEB Physics 1780 Lab 7: Magnetism Page 1 Lab 7: Magnetism Introduction Magnets need no introduction (i.e. introduction to be added in future revision). Experiments The purpose of these experiments is

More information

r where the electric constant

r where the electric constant 1.0 ELECTROSTATICS At the end of this topic, students will be able to: 10 1.1 Coulomb s law a) Explain the concepts of electrons, protons, charged objects, charged up, gaining charge, losing charge, charging

More information

Magnets. Magnetic vs. Electric

Magnets. Magnetic vs. Electric Magnets A force is applied to the iron filings causing them to align themselves to the direction of the magnetic field. A compass needle will tell you the direction of the field. Show Fields of little

More information

Section 1 Electric Charge and Force

Section 1 Electric Charge and Force CHAPTER OUTLINE Section 1 Electric Charge and Force Key Idea questions > What are the different kinds of electric charge? > How do materials become charged when rubbed together? > What force is responsible

More information

STEP-UP 2011 Lesson Plan: Capacitance Brian Heglund Etowah High School Advisor: Phil First

STEP-UP 2011 Lesson Plan: Capacitance Brian Heglund Etowah High School Advisor: Phil First STEP-UP 2011 Lesson Plan: Capacitance Brian Heglund Etowah High School Advisor: Phil First Ultra High Vacuum (UHV) at GT can analyze sample surfaces with Leed and Auger. Problem: Can this wire be used

More information

PHY 112L Activity 1 Electric Charges, Potentials, and Fields

PHY 112L Activity 1 Electric Charges, Potentials, and Fields PHY 112L Activity 1 Electric Charges, Potentials, and Fields Name: Section: ID #: Date: Lab Partners: TA initials: Objectives 1. Understand the basic properties, such as the magnitude and force, of electric

More information

AP Physics C - E & M

AP Physics C - E & M AP Physics C - E & M Current and Circuits 2017-07-12 www.njctl.org Electric Current Resistance and Resistivity Electromotive Force (EMF) Energy and Power Resistors in Series and in Parallel Kirchoff's

More information

MODULE 4.2 MAGNETISM ELECTRIC CURRENTS AND MAGNETISIM VISUAL PHYSICS ONLINE

MODULE 4.2 MAGNETISM ELECTRIC CURRENTS AND MAGNETISIM VISUAL PHYSICS ONLINE VISUAL PHYSICS ONLINE MODULE 4.2 MAGNETISM ELECTRIC CURRENTS AND MAGNETISIM When electric charges are in motion they exert forces on each other that can t be explained by Coulomb s law. If two parallel

More information

Electron Theory. Elements of an Atom

Electron Theory. Elements of an Atom Electron Theory Elements of an Atom All matter is composed of molecules which are made up of a combination of atoms. Atoms have a nucleus with electrons orbiting around it. The nucleus is composed of protons

More information

Electricity

Electricity Electricity Electric Charge There are two fundamental charges in the universe. Positive (proton) has a charge of +1.60 x 10-19 C Negative (electron) has a charge of 1.60 x 10-19 C There is one general

More information

Chapter 27, 28 & 29: Magnetism & Electromagnetic Induction

Chapter 27, 28 & 29: Magnetism & Electromagnetic Induction Chapter 27, 28 & 29: Magnetism & Electromagnetic Induction The Magnetic Field The Magnetic Force on Moving Charges The Motion of Charged Particles in a Magnetic Field The Magnetic Force Exerted on a Current-Carrying

More information

5. Positive charges one another.

5. Positive charges one another. 1. Electric field lines indicate A. Both direction and relative strength B. Neither direction nor strength 5. Positive charges one another. A. Repel B. Attract 2. Whether or not charges will move in a

More information

Learning Outcomes from Last Time. Class 3. Learning Outcomes. What Causes Forces -Two Experiments. What Causes Forces -Two Experiments

Learning Outcomes from Last Time. Class 3. Learning Outcomes. What Causes Forces -Two Experiments. What Causes Forces -Two Experiments Learning Outcomes from Last Time Class 3 Electrostatic Forces Physics 106 Winter 2018 Press CTRL-L to view as a slide show. You should be able to answer these questions: What is science? What is physics?

More information

Chapter 21 Magnetic Induction Lecture 12

Chapter 21 Magnetic Induction Lecture 12 Chapter 21 Magnetic Induction Lecture 12 21.1 Why is it called Electromagnetism? 21.2 Magnetic Flux and Faraday s Law 21.3 Lenz s Law and Work-Energy Principles 21.4 Inductance 21.5 RL Circuits 21.6 Energy

More information

Chapter 2: Fundamentals of Magnetism. 8/28/2003 Electromechanical Dynamics 1

Chapter 2: Fundamentals of Magnetism. 8/28/2003 Electromechanical Dynamics 1 Chapter 2: Fundamentals of Magnetism 8/28/2003 Electromechanical Dynamics 1 Magnetic Field Intensity Whenever a magnetic flux, φ, exist in a conductor or component, it is due to the presence of a magnetic

More information

Electric Force and Charge. Electric Force and Charge. Electric Force and Charge. Electric Force and Charge. Electric Force and Charge

Electric Force and Charge. Electric Force and Charge. Electric Force and Charge. Electric Force and Charge. Electric Force and Charge Hewitt/Lyons/Suchocki/Yeh Conceptual Integrated Science Chapter 7 ELECTRICITY AND MAGNETISM Electric forces can attract some objects and repel others Electric charge: the fundamental quantity that underlies

More information

PHYS 212 Final Exam (Old Material) Solutions - Practice Test

PHYS 212 Final Exam (Old Material) Solutions - Practice Test PHYS 212 Final Exam (Old Material) Solutions - Practice Test 1E If the ball is attracted to the rod, it must be made of a conductive material, otherwise it would not have been influenced by the nearby

More information

Can a Magnetic Field Produce a Current?

Can a Magnetic Field Produce a Current? Can a Magnetic Field Produce a Current? In our study of magnetism we learned that an electric current through a wire, or moving electrically charged objects, produces a magnetic field. Could the reverse

More information

What does it mean for an object to be charged? What are charges? What is an atom?

What does it mean for an object to be charged? What are charges? What is an atom? What does it mean for an object to be charged? What are charges? What is an atom? What are the components of an atom? Define the following: Electric Conductor Electric Insulator Define the following: Electric

More information

Symbol Meaning unit. 2. k 3. q. 4. r. 5. E 6. R Total 7. 1/R Total 8. P 9. V 10. I 11. R. 12. Q 13. N 14. e 15. F magnetic 16. v 17.

Symbol Meaning unit. 2. k 3. q. 4. r. 5. E 6. R Total 7. 1/R Total 8. P 9. V 10. I 11. R. 12. Q 13. N 14. e 15. F magnetic 16. v 17. Name period 3 rd 9 weeks test PEOPLE and SYMBOLS practice Instructions: Work in groups following Quiz-Quiz-Trade activity Date: Monday 2/25/13 Write what each symbol means, including the unit Symbol Meaning

More information

Solutions to these tests are available online in some places (but not all explanations are good)...

Solutions to these tests are available online in some places (but not all explanations are good)... The Physics GRE Sample test put out by ETS https://www.ets.org/s/gre/pdf/practice_book_physics.pdf OSU physics website has lots of tips, and 4 additional tests http://www.physics.ohiostate.edu/undergrad/ugs_gre.php

More information

Chapter 23: Magnetic Flux and Faraday s Law of Induction

Chapter 23: Magnetic Flux and Faraday s Law of Induction Chapter 3: Magnetic Flux and Faraday s Law of Induction Answers Conceptual Questions 6. Nothing. In this case, the break prevents a current from circulating around the ring. This, in turn, prevents the

More information

Material World: Electricity

Material World: Electricity 17. Coulomb s Law The force, F, between two objects with charge q1 and q2, is given by: k q q 1 2 F -, where r = distance between the two charges in meters 2 r k = Coulomb's constant = 9 X 10 9 m 2 /C

More information

Basic electromagnetism and electromagnetic induction

Basic electromagnetism and electromagnetic induction Basic electromagnetism and electromagnetic induction This worksheet and all related files are licensed under the Creative Commons Attribution License, version 1.0. To view a copy of this license, visit

More information

Electromagnetic Induction

Electromagnetic Induction Electromagnetic Induction Name Section Theory Electromagnetic induction employs the concept magnetic flux. Consider a conducting loop of area A in a magnetic field with magnitude B. The flux Φ is proportional

More information

Electrical measurements:

Electrical measurements: Electrical measurements: Last time we saw that we could define circuits though: current, voltage and impedance. Where the impedance of an element related the voltage to the current: This is Ohm s law.

More information

a. Clockwise. b. Counterclockwise. c. Out of the board. d. Into the board. e. There will be no current induced in the wire

a. Clockwise. b. Counterclockwise. c. Out of the board. d. Into the board. e. There will be no current induced in the wire Physics 1B Winter 2012: Final Exam For Practice Version A 1 Closed book. No work needs to be shown for multiple-choice questions. The first 10 questions are the makeup Quiz. The remaining questions are

More information

Materials Needed 1 D-Cell battery 6 6-inch pieces of wire 3 flashlight light bulbs 3 light bulb holders (optional)

Materials Needed 1 D-Cell battery 6 6-inch pieces of wire 3 flashlight light bulbs 3 light bulb holders (optional) Experiment Module 3 Electric Circuits Objective/Introduction This experiment explores building simple circuits and testing Ohm s Law. Students will start lighting a simple light bulb. Then they will explore

More information

Here are some internet links to instructional and necessary background materials:

Here are some internet links to instructional and necessary background materials: The general areas covered by the University Physics course are subdivided into major categories. For each category, answer the conceptual questions in the form of a short paragraph. Although fewer topics

More information

Lab 4. Current, Voltage, and the Circuit Construction Kit

Lab 4. Current, Voltage, and the Circuit Construction Kit Physics 2020, Spring 2009 Lab 4 Page 1 of 8 Your name: Lab section: M Tu Wed Th F TA name: 8 10 12 2 4 Lab 4. Current, Voltage, and the Circuit Construction Kit The Circuit Construction Kit (CCK) is a

More information

Fundamentals of Circuits I: Current Models, Batteries & Bulbs

Fundamentals of Circuits I: Current Models, Batteries & Bulbs Name: Lab Partners: Date: Pre-Lab Assignment: Fundamentals of Circuits I: Current Models, Batteries & Bulbs (Due at the beginning of lab) 1. Explain why in Activity 1.1 the plates will be charged in several

More information

Fun Demos and Activities

Fun Demos and Activities Fun Demos and Activities The following are demos and hands-on activities addressing a variety of electrical engineering and physics related phenomena. Magnetic Levitation Shows how a beam of light can

More information

In this unit, we will examine the movement of electrons, which we call CURRENT ELECTRICITY.

In this unit, we will examine the movement of electrons, which we call CURRENT ELECTRICITY. Recall: Chemistry and the Atom! What are the 3 subatomic Where are they found in the particles? atom? What electric charges do they have? How was a positive ion created? How was a negative ion created?

More information

CHAPTER 29: ELECTROMAGNETIC INDUCTION

CHAPTER 29: ELECTROMAGNETIC INDUCTION CHAPTER 29: ELECTROMAGNETIC INDUCTION So far we have seen that electric charges are the source for both electric and magnetic fields. We have also seen that these fields can exert forces on other electric

More information

we can said that matter can be regarded as composed of three kinds of elementary particles; proton, neutron (no charge), and electron.

we can said that matter can be regarded as composed of three kinds of elementary particles; proton, neutron (no charge), and electron. Physics II we can said that matter can be regarded as composed of three kinds of elementary particles; proton, neutron (no charge), and electron. Particle Symbol Charge (e) Mass (kg) Proton P +1 1.67

More information

HIGH SCHOOL SCIENCE. Physical Science 7: Electricity & Magnetism

HIGH SCHOOL SCIENCE. Physical Science 7: Electricity & Magnetism HIGH SCHOOL SCIENCE Physical Science 7: Electricity & Magnetism WILLMAR PUBLIC SCHOOL 2013-2014 EDITION CHAPTER 7 Electricity & Magnatism In this chapter you will: 1. Analyze factors that affect the strength

More information

The principles of conservation of energy and charge apply to electrical circuits. Properties of magnetic fields apply in nature and technology.

The principles of conservation of energy and charge apply to electrical circuits. Properties of magnetic fields apply in nature and technology. UIT E UMMARY KEY COCEPT CHAPTER UMMARY 11 The principles of conservation of energy and charge apply to electrical circuits. Electrical circuits Conventional current and electron flow Current, electrical

More information

Ideal wires, Ideal device models, Ideal circuits. Ideal models for circuit elements Wires

Ideal wires, Ideal device models, Ideal circuits. Ideal models for circuit elements Wires Ideal wires, Ideal device models, Ideal circuits Ideal models for circuit elements Wires Currents and Voltages Joints Resistors Voltage sources Current sources. EE 42 Lecture 1 1 Cast of Characters Fundamental

More information

Laboratory I: Impedance

Laboratory I: Impedance Physics 33, Fall 2008 ab I - Exercises aboratory I: Impedance eading: ab handout Simpson hapter if necessary) & hapter 2 particularly 2.9-2.3) ab Exercises. Part I What is the input impedance of the oscilloscope

More information

ElectroMagnetic Induction

ElectroMagnetic Induction ElectroMagnetic Induction Physics 1 What is E/M Induction? Electromagnetic Induction is the process of using magnetic fields to produce voltage, and in a complete circuit, a current. Michael Faraday first

More information

MOTORS AND GENERATORS

MOTORS AND GENERATORS DO PHYSCS ONLNE MOTORS AND GENERATORS view 1 Charge q Q [coulomb C] view 2 Current i [ampere A] view 3 Potential difference v V [volt V] Electric ield E [V.m -1 N.C -1 ] view 4 Resistance R [ohm ] view

More information

MAGNETIC DEFLECTION. OBJECTIVE: To observe the effect of a magnetic field on an electron beam. To measure the Earth s magnetic field.

MAGNETIC DEFLECTION. OBJECTIVE: To observe the effect of a magnetic field on an electron beam. To measure the Earth s magnetic field. MAGNETIC DEFLECTION OBJECTIVE: To observe the effect of a magnetic field on an electron beam. To measure the Earth s magnetic field. THEORY: Moving charges exert forces on one another that are not observed

More information