After completing this chapter, the student should be able to:

Save this PDF as:
 WORD  PNG  TXT  JPG

Size: px
Start display at page:

Download "After completing this chapter, the student should be able to:"

Transcription

1 Inductance OBJECTIVES After completing this chapter, the student should be able to: Explain the principles of inductance. Identify the basic units of inductance. Identify different types of inductors. Determine the total inductance in series and parallel circuits. Explain L/R time constants and how they relate to inductance. See accompanying CD for interactive presentations and tutorials relating to Chapter 10. When a current flows through a conductor, a magnetic field builds up around the conductor. This field contains energy and is the foundation for inductance. This chapter examines inductance and its application to DC circuits. Inductance is covered in more detail in Chapter 16. INDUCTANCE Inductance is the characteristic of an electrical conductor that opposes a change in current flow. An inductor is a device that stores energy in a magnetic field. Inductance exhibits the same effect on current in an electric circuit as inertia does on velocity of a mechanical object. It takes more work to no start a load moving than it does to keep it moving because the load possesses the property of inertia. Inertia is the characteristic of mass that opposes a change in velocity. Once current is moving through a conductor, inductance helps to keep it moving. The effects of inductance are sometimes desirable and other times undesirable. As noted in Chapter 9, the basic principle behind inductance states, when a current flows through a conductor, it generates a magnetic field around the conductor As the magnetic flux lines build up, they create an opposition to the flow of current. When the current changes direction or stops, or the magnetic field changes, an electromotive force (emf) is induced back into the conductor through the collapsing of the magnetic field. The opposition to the changes in current flow is iden-

2 CHAPTER 10 INDUCTANCE tified as counter electromotive force (counter emf). This effect is summarized by Lenz's law-an induced emf in any circuit is always in a direction to oppose the effect that produced it. The amount of counter emf is in proportion to the rate of change. The faster the rate of change, the greater the counter emf. All conductors have some inductance. The amount of inductance depends on the conductor and the shape of it. Straight wire has small amounts of inductance whereas coils of wire have much more inductance. The unit by which inductance is measured is the henry (H), named for Joseph Henry ( ), an American physicist. A henry is the amount of inductance required to induce an emf of 1 volt when the current in a conductor changes at the rate of 1 ampere per second. The henry is a large unit; the millihenry (mh) and microhenry (ILH) are more commonly used. The symbol for inductance is L. FIGURE 10-1 Schematic symbol for an inductor ~~ FIGURE 10-2 Schematic symbol for a variable inductor. -~- FIGURE 10-3 Several types of inductors used to vary the inductance QUESTIONS 1. Define inductance. 2. What is the unit for measuring inductance? 3. Define a henry. 4. What letter is used to represent inductance? FIXED INDUCTORS ImDINDUCTORS Inductors are devices designed to have a specific inductance. They consist of a conductor coiled around a core and are classifiedby the type of core material-magnetic or nonmagnetic. Figure 10-1 shows the symbol used for inductors. Inductors can also be fixed or variable. Figure 10-2 shows the symbol for a variable inductor. Variable inductors are created with adjustable core material. Figure 10-3 shows several types of VARIABLE INDUCTORS

3 SECTION I DC CIRCUITS FIGURE 10-4 An air-core inductor. FIGURE 10-6 Toroid-core inductor. FIGURE 10-5 Schematic symbol for an iron-core inductor ~~ inductors used for adjusting the core material. Maximum inductance occurs when the core material is in line with the coil of the wire. Air-core inductors, or inductors without core material, are used for up to 5 millihenries of inductance. They are wrapped on a ceramic or phenolic core (Figure 10-4). Ferrite and powdered iron cores are used for up to 200 millihenries. The symbol used for an iron-core inductor is shown in Figure Toroid cores are donut-shaped and offer a high inductance for a small size (Figure 10-6). The magnetic field is contained within the core. Shielded inductors have a shield made of magnetic material to protect them from the influence of other magnetic fields (Figure 10-7). Laminated iron-core inductors are used for all large inductors (Figure 10-8). These inductors vary from 0.1 to 100 henries, the inductance depending on the amount of current flowing through the inductor. These inductors are sometimes referred to as chokes. They are used in the filtering circuits of power supplies to remove AC FIGURE 10-7 Shielded inductor. components from the DC output. They will be discussed further later on. Inductors typically have tolerances of ± 10%, but tolerances of less than 1% are available. Inductors, like resistors, can be connected in series, parallel, or series-parallel combinations. The total inductance of several inductors connected in se-

4 CHAPTER 10 INDUCTANCE FIGURE 10-8 Laminated iron-core inductor. 5. What is the total inductance of a circuit with three inductors, 10 H, 3.5 H, and 6 H, connected in parallel? L/R TIME CONSTANTS A time constant is the time required for current through a conductor to increase to 63.2% or decrease to 36.8% of the maximum current. An RL circuit is shown in Figure LlR is the symbol used for the time constant of an RL circuit. This can be expressed as: L t =- R ries (separated to prevent their magnetic fields from interacting) is equal to the sum of the individual inductances. I,. = L1 + L2 + L Ln If two or more inductors are connected in parallel (with no interaction of their magnetic fields) the total inductance is found by using the formula: where: t = time in seconds L = inductance in henries R = resistance in ohms Figure charts the growth and decay (or increase and decrease) of a magnetic field, in terms of time constants. It takes five time constants to fully transfer all the energy into the magnetic field, or to build up the maximum magnetic field. It takes five full-time constants to completely collapse the magnetic field QUESTIONS 1. What are inductors? 2. Draw the symbols used to represent fixed and variable inductors. 3. What is another name for a laminated iron -core inductor? 4. What are the formulas for determining total inductance in: a. Series circuits? b. Parallel circuits? FIGURE 10-9 Circuit used to determine UR time constant. GROWTH DECAY

5 114 SECTION I DC CIRCUITS FIGURE Time constants required to build up or collapse the magnetic field in an inductor. I- 100 z w a: 80 o ::2! ~ 60 X «::2! 40 u... o -ן m 20 o a: w ~... I----GROWTH ---~~I... / ~ \9.301< 98.2% 95% / 86.5% \ J " 63.2% \ 1\:% I i "~ CL o 1 2 TIMECONSTANTS I---- DECAY j ~1 5.0% 1.8% ~ % 10-3 QUESTIONS 1. What is a time constant for an inductor? 2. How is a time constant determined? 3. How many time constants are required to fully build up a magnetic field for an inductor? 4. How many time constants are required to fully collapse a magnetic field for an inductor? 5. How long does it take to fully build up a magnetic field for a O.I-henry inductor in series with a IOO,OOO-ohmresistor? SUMMARY Inductance is the ability to store energy in a magnetic field. The unit for measuring inductance is the henry (H). The letter L represents inductance. Inductors are devices designed to have specific inductances. The symbol for fixed inductance is: ----~~~-- The symbol for a variable inductor is: Types of inductors include: air core, ferrite or powdered iron core, toroid core, shielded, and laminated iron core. The total inductance for inductors connected in series is calculated by the formula: LT = L J + L2 + L Ln The total inductance for inductors connected in parallel is: 1 1 III --= L J L2 L3 r., A time constant is the time required for current to increase to 63.2% or decrease to 36.8% of the maximum current.

6 CHAPTER 10 INDUCTANCE A time constant can be determined by the formula: L t =- R It takes five time constants to fully build up or collapse the magnetic field of an inductor. CHAPTER 10 SELF-TESr \ ".' 1. How can the magnetic field be increased for a particular inductance? 2. What is the total inductance for the circuit shown? 3. A 500-mH inductor and a 10-kilohm resistor are connected in series to a 2S-volt source. What will be the voltage across the inductor 100 microseconds after energizing the circuit?.' c-. ~= 800 /1H L4 = 125 /1H

Inductors are electronic components that oppose a change in current. Air Core Inductor Symbol

Inductors are electronic components that oppose a change in current. Air Core Inductor Symbol BASIC ELECTRICAL OBJECTIVES Discuss the construction of a Inductor Describe the way react differently in AC and DC circuits Define the calculations for connecting in Series and parallel INTRODUCTION are

More information

Chapter 11. Inductors. Objectives

Chapter 11. Inductors. Objectives Chapter 11 Inductors Objectives Describe the basic structure and characteristics of an inductor Discuss various types of inductors Analyze series inductors Analyze parallel inductors Analyze inductive

More information

Inductors. AC Theory. Module 3

Inductors. AC Theory. Module 3 Module 3 AC Theory What you ll learn in Module 3. Section 3.1 Electromagnetic Induction. Magnetic Fields around Conductors. The Solenoid. Section 3.2 Inductance & Back e.m.f. The Unit of Inductance. Factors

More information

Chapter 11. Inductors ISU EE. C.Y. Lee

Chapter 11. Inductors ISU EE. C.Y. Lee Chapter 11 Inductors Objectives Describe the basic structure and characteristics of an inductor Discuss various types of inductors Analyze series inductors Analyze parallel inductors Analyze inductive

More information

Inductors & Inductance. Electronic Components

Inductors & Inductance. Electronic Components Electronic Components Induction In 1824, Oersted discovered that current passing though a coil created a magnetic field capable of shifting a compass needle. Seven years later, Faraday and Henry discovered

More information

Induction. d. is biggest when the motor turns fastest.

Induction. d. is biggest when the motor turns fastest. Induction 1. A uniform 4.5-T magnetic field passes perpendicularly through the plane of a wire loop 0.10 m 2 in area. What flux passes through the loop? a. 5.0 T m 2 c. 0.25 T m 2 b. 0.45 T m 2 d. 0.135

More information

Physics 1214 Chapter 21: Electromagnetic Induction 02/15

Physics 1214 Chapter 21: Electromagnetic Induction 02/15 Physics 1214 Chapter 21: Electromagnetic Induction 02/15 1 Induction Experiments emf or electromotive force: (from Chapter 19) the influence that moves charge from lower to higher potential. induced current:

More information

Introduction to Electricity & Magnetism. Dr Lisa Jardine-Wright Cavendish Laboratory

Introduction to Electricity & Magnetism. Dr Lisa Jardine-Wright Cavendish Laboratory Introduction to Electricity & Magnetism Dr Lisa Jardine-Wright Cavendish Laboratory Examples of uses of electricity Christmas lights Cars Electronic devices Human body Electricity? Electricity is the presence

More information

April 1. Physics 272. Spring 2014 http://www.phys.hawaii.edu/~philipvd/pvd_14_spring_272_uhm.html. Prof. Philip von Doetinchem philipvd@hawaii.

April 1. Physics 272. Spring 2014 http://www.phys.hawaii.edu/~philipvd/pvd_14_spring_272_uhm.html. Prof. Philip von Doetinchem philipvd@hawaii. Physics 272 April 1 Spring 2014 http://www.phys.hawaii.edu/~philipvd/pvd_14_spring_272_uhm.html Prof. Philip von Doetinchem philipvd@hawaii.edu Phys272 - Spring 14 - von Doetinchem - 164 Summary Gauss's

More information

Basic Electrical Theory

Basic Electrical Theory Basic Electrical Theory Impedance PJM State & Member Training Dept. PJM 2014 10/24/2013 Objectives Identify the components of Impedance in AC Circuits Calculate the total Impedance in AC Circuits Identify

More information

Induced voltages and Inductance Faraday s Law

Induced voltages and Inductance Faraday s Law Induced voltages and Inductance Faraday s Law concept #1, 4, 5, 8, 13 Problem # 1, 3, 4, 5, 6, 9, 10, 13, 15, 24, 23, 25, 31, 32a, 34, 37, 41, 43, 51, 61 Last chapter we saw that a current produces a magnetic

More information

AC Generators. Basic Generator

AC Generators. Basic Generator AC Generators Basic Generator A basic generator consists of a magnetic field, an armature, slip rings, brushes and a resistive load. The magnetic field is usually an electromagnet. An armature is any number

More information

* Self-inductance * Mutual inductance * Transformers. PPT No. 32

* Self-inductance * Mutual inductance * Transformers. PPT No. 32 * Self-inductance * Mutual inductance * Transformers PPT No. 32 Inductance According to Faraday s Electromagnetic Induction law, induction of an electromotive force occurs in a circuit by varying the magnetic

More information

Slide 1 / 26. Inductance. 2011 by Bryan Pflueger

Slide 1 / 26. Inductance. 2011 by Bryan Pflueger Slide 1 / 26 Inductance 2011 by Bryan Pflueger Slide 2 / 26 Mutual Inductance If two coils of wire are placed near each other and have a current passing through them, they will each induce an emf on one

More information

Ch.20 Induced voltages and Inductance Faraday s Law

Ch.20 Induced voltages and Inductance Faraday s Law Ch.20 Induced voltages and Inductance Faraday s Law Last chapter we saw that a current produces a magnetic field. In 1831 experiments by Michael Faraday and Joseph Henry showed that a changing magnetic

More information

Circuits with inductors and alternating currents. Chapter 20 #45, 46, 47, 49

Circuits with inductors and alternating currents. Chapter 20 #45, 46, 47, 49 Circuits with inductors and alternating currents Chapter 20 #45, 46, 47, 49 RL circuits Ch. 20 (last section) Symbol for inductor looks like a spring. An inductor is a circuit element that has a large

More information

Objectives. Capacitors 262 CHAPTER 5 ENERGY

Objectives. Capacitors 262 CHAPTER 5 ENERGY Objectives Describe a capacitor. Explain how a capacitor stores energy. Define capacitance. Calculate the electrical energy stored in a capacitor. Describe an inductor. Explain how an inductor stores energy.

More information

Induction and Inductance

Induction and Inductance Induction and Inductance How we generate E by B, and the passive component inductor in a circuit. 1. A review of emf and the magnetic flux. 2. Faraday s Law of Induction 3. Lentz Law 4. Inductance and

More information

Last time : energy storage elements capacitor.

Last time : energy storage elements capacitor. Last time : energy storage elements capacitor. Charge on plates Energy stored in the form of electric field Passive sign convention Vlt Voltage drop across real capacitor can not change abruptly because

More information

EDEXCEL NATIONAL CERTIFICATE/DIPLOMA UNIT 5 - ELECTRICAL AND ELECTRONIC PRINCIPLES NQF LEVEL 3. OUTCOME 3 - MAGNETISM and INDUCTION

EDEXCEL NATIONAL CERTIFICATE/DIPLOMA UNIT 5 - ELECTRICAL AND ELECTRONIC PRINCIPLES NQF LEVEL 3. OUTCOME 3 - MAGNETISM and INDUCTION EDEXCEL NATIONAL CERTIFICATE/DIPLOMA UNIT 5 - ELECTRICAL AND ELECTRONIC PRINCIPLES NQF LEVEL 3 OUTCOME 3 - MAGNETISM and INDUCTION 3 Understand the principles and properties of magnetism Magnetic field:

More information

Eðlisfræði 2, vor 2007

Eðlisfræði 2, vor 2007 [ Assignment View ] [ Print ] Eðlisfræði 2, vor 2007 30. Inductance Assignment is due at 2:00am on Wednesday, March 14, 2007 Credit for problems submitted late will decrease to 0% after the deadline has

More information

TRANSFORMERS INTRODUCTION

TRANSFORMERS INTRODUCTION Tyco Electronics Corporation Crompton Instruments 1610 Cobb International Parkway, Unit #4 Kennesaw, GA 30152 Tel. 770-425-8903 Fax. 770-423-7194 TRANSFORMERS INTRODUCTION A transformer is a device that

More information

Diodes have an arrow showing the direction of the flow.

Diodes have an arrow showing the direction of the flow. The Big Idea Modern circuitry depends on much more than just resistors and capacitors. The circuits in your computer, cell phone, Ipod depend on circuit elements called diodes, inductors, transistors,

More information

Chapter 21 Electromagnetic Induction and Faraday s Law

Chapter 21 Electromagnetic Induction and Faraday s Law Lecture PowerPoint Chapter 21 Physics: Principles with Applications, 6 th edition Giancoli Chapter 21 Electromagnetic Induction and Faraday s Law 2005 Pearson Prentice Hall This work is protected by United

More information

Energy in Electrical Systems. Overview

Energy in Electrical Systems. Overview Energy in Electrical Systems Overview How can Potential Energy be stored in electrical systems? Battery Stored as chemical energy then transformed to electrical energy on usage Water behind a dam Water

More information

ALTERNATING CURRENTS

ALTERNATING CURRENTS ALTERNATING CURRENTS VERY SHORT ANSWER QUESTIONS Q-1. What is the SI unit of? Q-2. What is the average value of alternating emf over one cycle? Q-3. Does capacitor allow ac to pass through it? Q-4. What

More information

Electrical Circuits (2)

Electrical Circuits (2) Electrical Circuits (2) Lecture 5 Magnetically Coupled Circuits Dr.Eng. Basem ElHalawany Magnetically Coupled Circuits The circuits we have considered so far may be regarded as conductively coupled, because

More information

NZQA registered unit standard 20431 version 2 Page 1 of 7. Demonstrate and apply fundamental knowledge of a.c. principles for electronics technicians

NZQA registered unit standard 20431 version 2 Page 1 of 7. Demonstrate and apply fundamental knowledge of a.c. principles for electronics technicians NZQA registered unit standard 0431 version Page 1 of 7 Title Demonstrate and apply fundamental knowledge of a.c. principles for electronics technicians Level 3 Credits 7 Purpose This unit standard covers

More information

Line Reactors and AC Drives

Line Reactors and AC Drives Line Reactors and AC Drives Rockwell Automation Mequon Wisconsin Quite often, line and load reactors are installed on AC drives without a solid understanding of why or what the positive and negative consequences

More information

Transformers. What is a transformer?

Transformers. What is a transformer? Transformers What is a transformer? A transformer is a device that transfers electrical energy from one circuit to another through inductively coupled conductors the transformer's coils. A physical and

More information

Chapter 20. Magnetic Induction Changing Magnetic Fields yield Changing Electric Fields

Chapter 20. Magnetic Induction Changing Magnetic Fields yield Changing Electric Fields Chapter 20 Magnetic Induction Changing Magnetic Fields yield Changing Electric Fields Introduction The motion of a magnet can induce current in practical ways. If a credit card has a magnet strip on its

More information

SCS 139 II.3 Induction and Inductance

SCS 139 II.3 Induction and Inductance SCS 139 II.3 Induction and Inductance Dr. Prapun Suksompong prapun@siit.tu.ac.th L d dt di L dt B 1 Office Hours: Library (Rangsit) Mon 16:20-16:50 BKD 3601-7 Wed 9:20-11:20 Review + New Fact Review Force

More information

Inductor and Magnetic Product Terminology

Inductor and Magnetic Product Terminology INTRODUCTION IFC LPT ILB IHSM IM IMC LPE TJ LPC IRF IHB The scope of this application note is to define the terminology associated with inductors and their applications. Some of these terms are listed

More information

Objectives for the standardized exam

Objectives for the standardized exam III. ELECTRICITY AND MAGNETISM A. Electrostatics 1. Charge and Coulomb s Law a) Students should understand the concept of electric charge, so they can: (1) Describe the types of charge and the attraction

More information

AP Physics Electricity and Magnetism #4 Electrical Circuits, Kirchoff s Rules

AP Physics Electricity and Magnetism #4 Electrical Circuits, Kirchoff s Rules Name Period AP Physics Electricity and Magnetism #4 Electrical Circuits, Kirchoff s Rules Dr. Campbell 1. Four 240 Ω light bulbs are connected in series. What is the total resistance of the circuit? What

More information

Edmund Li. Where is defined as the mutual inductance between and and has the SI units of Henries (H).

Edmund Li. Where is defined as the mutual inductance between and and has the SI units of Henries (H). INDUCTANCE MUTUAL INDUCTANCE If we consider two neighbouring closed loops and with bounding surfaces respectively then a current through will create a magnetic field which will link with as the flux passes

More information

Series,"Parallel," and"series." Parallel"Circuits"

Series,Parallel, andseries. ParallelCircuits chapter 25 Series,"Parallel," and"series." Parallel"Circuits" FIGURE 25.1 A series circuit with three bulbs. All current flows through all resistances (bulbs). The total resistance of the circuit is the

More information

AC 1 Fundamentals. Ê>{X4èRÆ3lË. Student Workbook Edition 4

AC 1 Fundamentals. Ê>{X4èRÆ3lË. Student Workbook Edition 4 AC 1 Fundamentals Student Workbook 91562-00 Edition 4 Ê>{X4èRÆ3lË 3091562000503 FOURTH EDITION Second Printing, March 2005 Copyright March, 2003 Lab-Volt Systems, Inc. All rights reserved. No part of

More information

Extra Questions - 1. 1. What current will flow in a 20Ω resistor when it is connected to a 50V supply? a) 0.4A b) 1.6A c) 2.5A

Extra Questions - 1. 1. What current will flow in a 20Ω resistor when it is connected to a 50V supply? a) 0.4A b) 1.6A c) 2.5A Extra Questions - 1 1. What current will flow in a 20Ω resistor when it is connected to a 50V supply? a) 0.4A b) 1.6A c) 2.5A 2. A current of 500mA flows in a resistance of 12Ω. What power is dissipated

More information

Basic AC Reactive Components IMPEDANCE

Basic AC Reactive Components IMPEDANCE Basic AC Reactive Components Whenever inductive and capacitive components are used in an AC circuit, the calculation of their effects on the flow of current is important. EO 1.9 EO 1.10 EO 1.11 EO 1.12

More information

Name: Lab Partner: Section: The purpose of this lab is to study induction. Faraday s law of induction and Lenz s law will be explored.

Name: Lab Partner: Section: The purpose of this lab is to study induction. Faraday s law of induction and Lenz s law will be explored. Chapter 8 Induction - Faraday s Law Name: Lab Partner: Section: 8.1 Purpose The purpose of this lab is to study induction. Faraday s law of induction and Lenz s law will be explored. 8.2 Introduction It

More information

When we do not get specific resistor values we have to either use variable resistors such as

When we do not get specific resistor values we have to either use variable resistors such as RESISTOR COMBINATIONS When we do not get specific resistor values we have to either use variable resistors such as potentiometers or presets to obtain such precise values. Pots are too expensive to use

More information

Faraday s Law of Induction

Faraday s Law of Induction Faraday s Law of Induction Potential drop along the closed contour is minus the rate of change of magnetic flu. We can change the magnetic flu in several ways including changing the magnitude of the magnetic

More information

Chapt ha e pt r e r 12 RL Circuits

Chapt ha e pt r e r 12 RL Circuits Chapter 12 RL Circuits Sinusoidal Response of RL Circuits The inductor voltage leads the source voltage Inductance causes a phase shift between voltage and current that depends on the relative values of

More information

Inductance. Motors. Generators

Inductance. Motors. Generators Inductance Motors Generators Self-inductance Self-inductance occurs when the changing flux through a circuit arises from the circuit itself. As the current increases, the magnetic flux through a loop due

More information

Voltage, Current, Resistance, Capacitance and Inductance

Voltage, Current, Resistance, Capacitance and Inductance Voltage, Current, Resistance, Capacitance and Inductance Really basic electrical engineering. 1 Electricity and conductors Electricity is the movement of electrons. Electrons move easily through a conductor

More information

Saturday X-tra X-Sheet: 19. Electric circuits

Saturday X-tra X-Sheet: 19. Electric circuits Saturday X-tra X-Sheet: 9 Key Concepts Electric circuits This lesson focuses on the following: Potential Difference Current The resistance of a conductor Ohm s Law and circuit calculations Terminology

More information

EE301 Lesson 14 Reading: 10.1-10.4, 10.11-10.12, 11.1-11.4 and 11.11-11.13

EE301 Lesson 14 Reading: 10.1-10.4, 10.11-10.12, 11.1-11.4 and 11.11-11.13 CAPACITORS AND INDUCTORS Learning Objectives EE301 Lesson 14 a. Define capacitance and state its symbol and unit of measurement. b. Predict the capacitance of a parallel plate capacitor. c. Analyze how

More information

Reading Quiz. 1. Currents circulate in a piece of metal that is pulled through a magnetic field. What are these currents called?

Reading Quiz. 1. Currents circulate in a piece of metal that is pulled through a magnetic field. What are these currents called? Reading Quiz 1. Currents circulate in a piece of metal that is pulled through a magnetic field. What are these currents called? A. Induced currents B. Displacement currents C. Faraday s currents D. Eddy

More information

Application Note. So You Need to Measure Some Inductors?

Application Note. So You Need to Measure Some Inductors? So You Need to Measure Some nductors? Take a look at the 1910 nductance Analyzer. Although specifically designed for production testing of inductors and coils, in addition to measuring inductance (L),

More information

AP Physics C Chapter 23 Notes Yockers Faraday s Law, Inductance, and Maxwell s Equations

AP Physics C Chapter 23 Notes Yockers Faraday s Law, Inductance, and Maxwell s Equations AP Physics C Chapter 3 Notes Yockers Faraday s aw, Inductance, and Maxwell s Equations Faraday s aw of Induction - induced current a metal wire moved in a uniform magnetic field - the charges (electrons)

More information

Resistors and Ohms Law

Resistors and Ohms Law Resistors and Ohms Law A wire is an ideal conductor with no resistance (at least for our discussion). n contrast, a resistor is a component that purposefully impedes or opposes the flow of electrons. As

More information

INTRODUCTION SELF INDUCTANCE. Introduction. Self inductance. Mutual inductance. Transformer. RLC circuits. AC circuits

INTRODUCTION SELF INDUCTANCE. Introduction. Self inductance. Mutual inductance. Transformer. RLC circuits. AC circuits Chapter 13 INDUCTANCE Introduction Self inductance Mutual inductance Transformer RLC circuits AC circuits Magnetic energy Summary INTRODUCTION Faraday s important contribution was his discovery that achangingmagneticflux

More information

Chapter 20.1 Induced EMF and magnetic flux

Chapter 20.1 Induced EMF and magnetic flux Chapter 20.1 nduced EMF and magnetic flux Electric current gives rise to magnetic fields Can a magnetic field give rise to a current? Michael Faraday 1791-1867 The answer is yes as discovered by Michael

More information

Lecture 10 Induction and Inductance Ch. 30

Lecture 10 Induction and Inductance Ch. 30 Lecture 10 Induction and Inductance Ch. 30 Cartoon - Faraday Induction Opening Demo - Thrust bar magnet through coil and measure the current Warm-up problem Topics Faraday s Law Lenz s Law Motional Emf

More information

RUPHYS ( MPCIZEWSKI15079 ) My Courses Course Settings University Physics with Modern Physics, 13e Young/Freedman

RUPHYS ( MPCIZEWSKI15079 ) My Courses Course Settings University Physics with Modern Physics, 13e Young/Freedman Signed in as Jolie Cizewski, Instructor Help Sign Out RUPHYS2272014 ( MPCIZEWSKI15079 ) My Courses Course Settings University Physics with Modern Physics, 13e Young/Freedman Course Home Assignments Roster

More information

Inductors. Resources and methods for learning about these subjects (list a few here, in preparation for your research):

Inductors. Resources and methods for learning about these subjects (list a few here, in preparation for your research): Inductors 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 http://creativecommons.org/licenses/by/1.0/,

More information

Fall 12 PHY 122 Homework Solutions #10

Fall 12 PHY 122 Homework Solutions #10 Fall 12 PHY 122 Homework Solutions #10 HW10: Ch.30 Q5, 8, 15,17, 19 P 1, 3, 9, 18, 34, 36, 42, 51, 66 Chapter 30 Question 5 If you are given a fixed length of wire, how would you shape it to obtain the

More information

Aircraft Electrical System

Aircraft Electrical System Chapter 9 Aircraft Electrical System Introduction The satisfactory performance of any modern aircraft depends to a very great degree on the continuing reliability of electrical systems and subsystems.

More information

Electric Circuits. Concepts and Principles. Electric Circuits as Applied Physics. The Resistor

Electric Circuits. Concepts and Principles. Electric Circuits as Applied Physics. The Resistor . Electric ircuits oncepts and Principles Electric ircuits as Applied Physics Electric circuits are one of the most practical applications of our understanding of electric and magnetic fields. In general,

More information

Navy Electricity and Electronics Training Series

Navy Electricity and Electronics Training Series NONRESIDENT TRAINING COURSE SEPTEMBER 1998 Navy Electricity and Electronics Training Series Module 2 Introduction to Alternating Current and Transformers NAVEDTRA 14174 DISTRIBUTION STATEMENT A: Approved

More information

PS-6.2 Explain the factors that determine potential and kinetic energy and the transformation of one to the other.

PS-6.2 Explain the factors that determine potential and kinetic energy and the transformation of one to the other. PS-6.1 Explain how the law of conservation of energy applies to the transformation of various forms of energy (including mechanical energy, electrical energy, chemical energy, light energy, sound energy,

More information

Einstein Classes, Unit No. 102, 103, Vardhman Ring Road Plaza, Vikas Puri Extn., Outer Ring Road, New Delhi , Ph. : ,

Einstein Classes, Unit No. 102, 103, Vardhman Ring Road Plaza, Vikas Puri Extn., Outer Ring Road, New Delhi , Ph. : , 1 EMI & AC 1. Derive an expression for the impendance of a coil in AC ciruit. A current of 1.1 A flows through a coil when connected to a 110 V DC. When 110 V AC of 50 Hz is applied to the same coil, only

More information

Chapter 14. Transformers ISU EE. C.Y. Lee

Chapter 14. Transformers ISU EE. C.Y. Lee Chapter 14 Transformers Objectives Explain mutual inductance Describe how a transformer is constructed and how it works Explain how a step-up and -down transformer works Discuss the effect of a resistive

More information

W03 Analysis of DC Circuits. Yrd. Doç. Dr. Aytaç Gören

W03 Analysis of DC Circuits. Yrd. Doç. Dr. Aytaç Gören W03 Analysis of DC Circuits Yrd. Doç. Dr. Aytaç Gören ELK 2018 - Contents W01 Basic Concepts in Electronics W02 AC to DC Conversion W03 Analysis of DC Circuits (self and condenser) W04 Transistors and

More information

Lab 5: Basic Direct-Current Circuits Edited 11/20/14 by Joe Skitka, Stephen Albright, WL, JCH & DGH

Lab 5: Basic Direct-Current Circuits Edited 11/20/14 by Joe Skitka, Stephen Albright, WL, JCH & DGH Lab 5: Basic Direct-Current Circuits Edited 11/20/14 by Joe Skitka, Stephen Albright, WL, JCH & DGH Objective This set of mini-experiments aims to verify rules governing the addition of resistors and capacitors

More information

1. Title Electrical fundamentals II (Mechanics Repair and Maintenance)

1. Title Electrical fundamentals II (Mechanics Repair and Maintenance) 1. Title Electrical fundamentals II (Mechanics Repair and Maintenance) 2. Code EMAMBG429A 3. Range The knowledge is needed for a wide range of aircraft repair and maintenance works,e.g. applicable to aircrafts,

More information

RESISTANCE, REACTANCE AND IMPEDANCE A Primer. Douglas Brooks, PhD UltraCAD Design, Inc. PART 2, REACTANCE

RESISTANCE, REACTANCE AND IMPEDANCE A Primer. Douglas Brooks, PhD UltraCAD Design, Inc. PART 2, REACTANCE RESISTANCE, REACTANCE AND IMPEDANCE A Primer Douglas Brooks, PhD UltraCAD Design, Inc. PART 2, REACTANCE This is part 2 of a 3-part series on resistance, reactance and impedance. Most of us are familiar

More information

Chap 21. Electromagnetic Induction

Chap 21. Electromagnetic Induction Chap 21. Electromagnetic Induction Sec. 1 - Magnetic field Magnetic fields are produced by electric currents: They can be macroscopic currents in wires. They can be microscopic currents ex: with electrons

More information

Revision Calcs. 1. The flux produced by a magnet is 10mWb. Determine the flux density if the area of the pole is 250 mm 2

Revision Calcs. 1. The flux produced by a magnet is 10mWb. Determine the flux density if the area of the pole is 250 mm 2 EMA Revision Calcs Miller College Revision Calcs Revision Calcs 1. The flux produced by a magnet is 10mWb. Determine the flux density if the area of the pole is 250 mm 2 2. For the magnet in the previous

More information

12. The current in an inductor is changing at the rate of 100 A/s, and the inductor emf is 40 V. What is its self-inductance?

12. The current in an inductor is changing at the rate of 100 A/s, and the inductor emf is 40 V. What is its self-inductance? 12. The current in an inductor is changing at the rate of 100 A/s, and the inductor emf is 40 V. What is its self-inductance? From Equation 32-5, L = -E=(dI =dt) = 40 V=(100 A/s) = 0.4 H. 15. A cardboard

More information

Questions. Question 1

Questions. Question 1 Question 1 Questions Explain why transformers are used extensively in long-distance power distribution systems. What advantage do they lend to a power system? file 02213 Question 2 Are the transformers

More information

2. A conductor of length 2m moves at 4m/s at 30 to a uniform magnetic field of 0.1T. Which one of the following gives the e.m.f. generated?

2. A conductor of length 2m moves at 4m/s at 30 to a uniform magnetic field of 0.1T. Which one of the following gives the e.m.f. generated? Extra Questions - 2 1. A straight length of wire moves through a uniform magnetic field. The e.m.f. produced across the ends of the wire will be maximum if it moves: a) along the lines of magnetic flux

More information

The W5JCK Guide to the Mathematic Equations Required for the Amateur Extra Class Exam

The W5JCK Guide to the Mathematic Equations Required for the Amateur Extra Class Exam The W5JCK Guide to the Mathematic Equations Required for the Amateur Extra Class Exam This document contains every question from the Extra Class (Element 4) Question Pool* that requires one or more mathematical

More information

EE 1202 Experiment #4 Capacitors, Inductors, and Transient Circuits

EE 1202 Experiment #4 Capacitors, Inductors, and Transient Circuits EE 1202 Experiment #4 Capacitors, Inductors, and Transient Circuits 1. Introduction and Goal: Exploring transient behavior due to inductors and capacitors in DC circuits; gaining experience with lab instruments.

More information

BASIC ELECTRONICS AC CIRCUIT ANALYSIS. December 2011

BASIC ELECTRONICS AC CIRCUIT ANALYSIS. December 2011 AM 5-202 BASIC ELECTRONICS AC CIRCUIT ANALYSIS December 2011 DISTRIBUTION RESTRICTION: Approved for Pubic Release. Distribution is unlimited. DEPARTMENT OF THE ARMY MILITARY AUXILIARY RADIO SYSTEM FORT

More information

Chapter 34 Faraday s Law & Electromagnetic Induction

Chapter 34 Faraday s Law & Electromagnetic Induction Chapter 34 Faraday s Law & Electromagnetic Induction Faraday s Discovery (~ 1831) Faraday found that a changing magnetic field creates a current in a wire. This is an informal statement of Faraday s law.

More information

Direction of Induced Current

Direction of Induced Current Direction of Induced Current Bar magnet moves through coil Current induced in coil A S N v Reverse pole Induced current changes sign B N S v v Coil moves past fixed bar magnet Current induced in coil as

More information

Coil Testing in a Manufacturing Environment

Coil Testing in a Manufacturing Environment Coil Testing in a Manufacturing Environment by Anthony Pretto, International Electro-Magnetics, Inc. Quality control is an integral part of any manufacturing process. As a part of that process, it is important

More information

MAGNETISM MAGNETISM. Principles of Imaging Science II (120)

MAGNETISM MAGNETISM. Principles of Imaging Science II (120) Principles of Imaging Science II (120) Magnetism & Electromagnetism MAGNETISM Magnetism is a property in nature that is present when charged particles are in motion. Any charged particle in motion creates

More information

First Year (Electrical & Electronics Engineering)

First Year (Electrical & Electronics Engineering) Z PRACTICAL WORK BOOK For The Course EE-113 Basic Electrical Engineering For First Year (Electrical & Electronics Engineering) Name of Student: Class: Batch : Discipline: Class Roll No.: Examination Seat

More information

1) 10. V 2) 20. V 3) 110 V 4) 220 V

1) 10. V 2) 20. V 3) 110 V 4) 220 V 1. The diagram below represents an electric circuit consisting of a 12-volt battery, a 3.0-ohm resistor, R 1, and a variable resistor, R 2. 3. What is the total resistance of the circuit 1) 6.6 Ω 2) 10

More information

Faraday s Law and Inductance

Faraday s Law and Inductance Historical Overview Faraday s Law and Inductance So far studied electric fields due to stationary charges and magentic fields due to moving charges. Now study electric field due to a changing magnetic

More information

WOUND COMPONENTS. Measurement needs, problems and solutions David Sheath Application Engineer

WOUND COMPONENTS. Measurement needs, problems and solutions David Sheath Application Engineer WOUND COMPONENTS Measurement needs, problems and solutions David Sheath Application Engineer Wound components appear to be simple devices - easy to design, manufacture and test. In reality they are complex

More information

Inductance. Resources and methods for learning about these subjects (list a few here, in preparation for your research):

Inductance. Resources and methods for learning about these subjects (list a few here, in preparation for your research): Inductance 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 http://creativecommons.org/licenses/by/1.0/,

More information

ELECTROMAGNETIC INDUCTION (Y&F Chapters 30, 31; Ohanian Chapter 32) The Electric and magnetic fields are inter-related

ELECTROMAGNETIC INDUCTION (Y&F Chapters 30, 31; Ohanian Chapter 32) The Electric and magnetic fields are inter-related EMF Handout 9: Electromagnetic Induction 1 ELECTROMAGNETIC INDUCTION (Y&F Chapters 30, 31; Ohanian Chapter 32) This handout covers: Motional emf and the electric generator Electromagnetic Induction and

More information

Ch. 20 Electric Circuits

Ch. 20 Electric Circuits Ch. 0 Electric Circuits 0. Electromotive Force Every electronic device depends on circuits. Electrical energy is transferred from a power source, such as a battery, to a device, say a light bulb. Conducting

More information

Electromagnetic Induction

Electromagnetic Induction Electromagnetic Induction PHY232 Remco Zegers zegers@nscl.msu.edu Room W109 cyclotron building http://www.nscl.msu.edu/~zegers/phy232.html previously: electric currents generate magnetic field. If a current

More information

Level 2 Physics: Demonstrate understanding of electricity and electromagnetism

Level 2 Physics: Demonstrate understanding of electricity and electromagnetism Level 2 Physics: Demonstrate understanding of electricity and electromagnetism Static Electricity: Uniform electric field, electric field strength, force on a charge in an electric field, electric potential

More information

Experiment IV: Magnetic Fields and Inductance

Experiment IV: Magnetic Fields and Inductance Experiment IV: Magnetic Fields and Inductance I. References Tipler and Mosca, Physics for Scientists and Engineers, 5th Ed., Chapter 7 Purcell, Electricity and Magnetism, Chapter 6 II. Equipment Digital

More information

Transformer Calculations

Transformer Calculations Transformer Calculations Transformers Transformers are one of the most basic yet practical devices used today. No matter where you are there is always a transformer nearby. They are used throughout alternating-current

More information

physics 112N electromagnetic induction

physics 112N electromagnetic induction physics 112N electromagnetic induction experimental basis of induction! seems we can induce a current in a loop with a changing magnetic field physics 112N 2 magnetic flux! useful to define a quantity

More information

Inductive and Capacitive Reactance

Inductive and Capacitive Reactance Inductive and Capacitive Reactance Course No: E04-005 Credit: 4 PDH A. Bhatia Continuing Education and Development, Inc. 9 Greyridge Farm Court Stony Point, NY 10980 P: (877) 322-5800 F: (877) 322-4774

More information

Chapter 30 Inductance

Chapter 30 Inductance Chapter 30 Inductance In this chapter we investigate the properties of an inductor in a circuit. There are two kinds of inductance mutual inductance and self-inductance. An inductor is formed by taken

More information

UETTDRIS32A Solve electrical problems in remote community network apparatus

UETTDRIS32A Solve electrical problems in remote community network apparatus UETTDRIS32A Solve electrical problems in remote community network apparatus Release: 1 UETTDRIS32A Solve electrical problems in remote community network apparatus Modification History Not applicable. Unit

More information

NZQA registered unit standard version 2 Page 1 of 7. Demonstrate and apply fundamental knowledge of d.c. principles for electronics technicians

NZQA registered unit standard version 2 Page 1 of 7. Demonstrate and apply fundamental knowledge of d.c. principles for electronics technicians Page 1 of 7 Title Demonstrate and apply fundamental knowledge of d.c. principles for electronics technicians Level 3 Credits 7 Purpose This unit standard covers an introduction to direct current principles

More information

THE TRANSFORMER. REFERENCES: PASCO Transformer Notes Physics for Scientists and Engineers, Tipler, 4 th Ed., Vol. 2 INTRODUCTION.

THE TRANSFORMER. REFERENCES: PASCO Transformer Notes Physics for Scientists and Engineers, Tipler, 4 th Ed., Vol. 2 INTRODUCTION. THE TRANSFORMER LAB ELEC 7 REFERENCES: PASCO Transformer Notes Physics for Scientists and Engineers, Tipler, 4 th Ed., Vol. 2 NTRODUCTON Nearly all of today s electrical energy is produced as alternating

More information

Experiment 1 The DC Machine

Experiment 1 The DC Machine Experiment 1 The DC Machine ECEN 4517 R. W. Erickson and D. Maksimovic The purpose of this experiment is to become familiar with operating principles, equivalent circuit models, and basic characteristics

More information

Chapter 12. RL Circuits. Objectives

Chapter 12. RL Circuits. Objectives Chapter 12 RL Circuits Objectives Describe the relationship between current and voltage in an RL circuit Determine impedance and phase angle in a series RL circuit Analyze a series RL circuit Determine

More information

Electrical Fundamentals - Reactance and Impedance

Electrical Fundamentals - Reactance and Impedance PDHonline Course E239 (4 PDH) Electrical Fundamentals - Reactance and Impedance Instructor: A. Bhatia, B.E. 2012 PDH Online PDH Center 5272 Meadow Estates Drive Fairfax, VA 22030-6658 Phone & Fax: 703-988-0088

More information