Electrical Circuits: Ohm’s Law
Electricity and ElectronicsElectrical Circuits: Ohm’s Law
IntroductionThis program illustrates the arrangements and operations of basic electrical circuitry. Studentswill learn the differences between a series and parallel circuit, along with some of the rules relating to the operation of these particular circuits. The operation and configuration of a series-parallel circuit will also be discussed. The program also explains how Ohm's Law can be appliedwhen calculating voltage, current, and resistance values. Students will discover the relationshipbetween voltage, current, and resistance, and how they affect each other. Finally, the programwill demonstrate how voltage, current, and resistance values can be obtained in more complexcircuits. The information contained in Ohm’s Law enables students to comprehend the basicconcepts and principles of electrical circuitry.This program is organized into major sections or topics. Each section covers one major segmentof the subject. Graphic breaks are given between each section so that you can stop the video forclass discussion, demonstrations, to answer questions, or to ask questions. This allows you towatch only a portion of the program each day, or to present it in its entirety.This program is part of the ten-part series Electricity and Electronics, which includes thefollowing titles: Electrical Principles Electrical Circuits: Ohm's Law Electrical Components Part I: Resistors, Batteries, and Switches Electrical Components Part II: Capacitors, Fuses, Flashers, and Coils Electrical Components Part III: Transformers, Relays, and Motors Electronic Components Part I: Semiconductors, Transistors, and Diodes Electronic Components Part II: Operation—Transistors and Diodes Electronic Components Part III: Thyristors, Piezo Crystals, Solar Cells, and Fiber Optics Electrical Troubleshooting Electronic Circuit RepairTo order additional titles please see Additional Resources at www.filmsmediagroup.com atthe end of this guide.Student ObjectivesAfter viewing this program, the student will be able to:2 Explain the basic operation of a basic circuit Describe the difference between a series circuit and a parallel circuit Define the term series-parallel circuit Explain the function of a hot leg circuit Describe the basic purpose of a ground leg circuit List the basic rules relating to the operation of series and parallel circuits Explain the purpose of Ohm's LawCopyright 2006 Shopware
Calculate voltage, current, and resistance in a series and parallel circuit Understand the relationship between voltage, current, and resistance values in a circuit Calculate voltage, current, and resistance in a series-parallel circuitDiscussion Topics1. Name some of the electrical devices you encounter in your home.2. Can you think of any advantages of wiring a circuit in series?3. What are some of the applications of a series-parallel circuit?4. Can you think of any applications for a frame-ground circuit, other than an automobile?5. Which type of circuit would be easier to troubleshoot, a series circuit or a parallel circuit?6. Would you wire the batteries in an electric car in a series or in parallel?7. Can you think of any mechanism which uses a variable resistor?8. Do you think the field of electricity and electronics could have advanced to its present statewithout the discovery of Ohm's Law?Short AnswersBriefly answer the following questions in your own words:1. Explain the operation of a series circuit.2. Describe the function of a hot leg circuit.3. How does a parallel circuit operate?4. What is a frame-ground circuit?5. Explain the operation of a series-parallel circuit.6. What rules should be remembered when calculating parallel circuit values?7. Explain the purpose of a ground leg circuit.8. List the rules to remember when calculating parallel circuit values.9. Name the three basic formulas stated in Ohm's law.10. What is the most basic rule in electricity?Technical TermsWrite definitions for the following terms. Use a textbook or review the video if needed.series circuitground leg circuitresistancevariable resistor3parallel circuitseries legvoltageohmmeterseries-parallel circuitparallel legscurrenthot leg circuitOhm's Lawresistor
Quiz1. A circuit only has one path for current flow.a. parallelb. seriesc. series-paralleld. parallel-series2. A(n) circuit has more than one path or leg for current flow.a. seriesb. parallelc. parallel-seriesd. electronic3. The leg refers to the section of the circuit that carries current to a load.a. groundb. negativec. hotd. parallel4. The leg is the circuit that returns current to the source of voltage.a. groundb. positivec. hotd. parallel5. Which of these circuits uses the metal structure of a chassis as a conductor?a. parallelb. seriesc. frame-groundd. series-parallel6. The most basic rule in electricity is that follow(s) the path of least resistance.a. ohmsb. wattagec. voltaged. current7. Ohm's Law is a simple formula used to express the relationship between voltage, current, and.a. ampsb. resistancec. electronsd. wattage8. Which of these statement is true concerning a series circuit?a. Current is the same everywhere in the circuit.b. Total ohms is the sum of all resistance.c. Voltage drop across the loads equals the voltage applied.d. All of the above.9. Which of these statements is true concerning a parallel circuit?a. Total current is the sum of all branches.b. Total circuit resistance is more than any one branch.c. Resistance applied to each branch is the same.d. All of the above.10. According to Ohm's Law, current equals voltage by resistance.a. multipliedb. subtractedc. dividedd. none of the above4
11. According to Ohm's Law, which of the following statements is true?a. Voltage equals current divided by resistance.b. Voltage equals resistance subtracted by current.c. Voltage equals current times resistance.d. None of the above.12. If there are two four-ohm resistances in a twelve volt series circuit, what is the approximatecurrent flow in this circuit?a. 3.4 ampsb. 1.5 ampsc. 5.3 ampsd. 2.5 amps13. If there are three four-ohm resistances in a two amp series circuit, what is the amount ofvoltage applied to this circuit?a. 12 voltsb. 6 voltsc. 24 voltsd. 3 volts14. If a parallel circuit has three branches carrying four amps each, what would the totalcircuit current value be?a. 8 ampsb. 6 ampsc. 4 ampsd. 12 amps15. What is the total resistance in a parallel circuit in which R-1 equals 4 ohms and R-2 equals6 ohms?a. 2.4 ohmsb. 6.0 ohmsc. 3.5 ohmsd. 8.0 ohms5
Answer KeyUse your own judgment to evaluate the Discussion Topics, Short Answers, and Technical Terms.Quiz Answer Key:1. b 2. b 3. c4. a5. c6. d9. a10. c7. b8. d11. c 12. b 13. c 14. d 15. aUseful Web SitesIEEE Virtual Museum—The History of Electricity, Electronics, and Computerswww.ieee-virtual-museum.orgCommunity Learning NetworkClick on "Technology Education" for educational resources in Electronics and Electricityhttp://www.cln.org/subject index.htmlGreatest Engineering Achievements of the 20th CenturyClick on "Electrification," "Electronics," and morehttp://www.greatachievements.orgSuperconductor Information for Beginnershttp://superconductors.orgAdditional Resources at www.filmsmediagroup.comAvailable from Films Media Group www.filmsmediagroup.com 1-800-257-5126Electricity and Electronics VHS/DVD Preview clip online Viewable/printable teacher’s guide online Item # 34798The program you have just viewed is part of the ten-part series Electricity and Electronics. Theseries provides a comprehensive guide to the study of electronics, ranging from the fundamentallaws and principles of electricity at the atomic level to troubleshooting and repair of electroniccomponents. Lively computer animation and hands-on demonstrations make these videos anideal resource for the classroom. A Shopware Production. (18-24 minutes each)6The series includes: Electrical Principles; Electrical Circuits: Ohm's Law; ElectricalComponents Part I: Resistors, Batteries, and Switches; Electrical Components Part II:Capacitors, Fuses, Flashers, and Coils; Electrical Components Part III: Transformers, Relays,
and Motors; Electronic Components Part I: Semiconductors, Transistors, and Diodes;Electronic Components Part II: Operation—Transistors and Diodes; Electronic ComponentsPart III: Thyristors, Piezo Crystals, Solar Cells, and Fiber Optics; Electrical Troubleshooting;Electronic Circuit RepairElectric Power on the Move VHS/DVD-R Viewable/printable teacher’s guide online Produced in association with the Accreditation Board for Engineering and Technologyand the Junior Engineering Technical Society Item # 34288This Science Screen Report looks at the production, transportation, and consumption of electricity. Using the Hoover Dam as an example of efficient hydroelectric power generation, the videoillustrates how transformers raise or lower voltage and how electricity is channeled to illuminatebuildings, power devices, and propel vehicles. The difference between alternating and direct current is discussed, as well as advantages of neon over filament bulbs. Animated segments helpstudents with vital electrical concepts, including ohms, volts, and amperes. 2004. (18 minutes)Residential Electrical Wiring VHS/DVD Preview clip online Viewable/printable teacher’s guide online Correlates to the National Center for Construction Education and Research standards. Item # 32070This eight-part series is filled with information on installing, upgrading, and updating residentialelectrical service, walking students through all the major processes they’ll need to know.A Shopware Production. 2004. (16-21 minutes each)The series includes: The Service Entrance; Panelboards; Wiring Methods; Grounding;GFCIs and AFCIs; Receptacles and Switches; Wiring Light Fixtures; Wiring for AppliancesElectricity VHS/DVD-R Viewable/printable teacher’s guide online Item # 3548This six-part series covers many of the fundamental concepts in the study of electricity. Itexplores the mystery of electricity’s causes and effects, and enable students to visualize—andthereby understand—abstract and sometimes difficult concepts in physics. (10 minutes each)The series includes: Conductors and Insulators; Charging and Discharging; Charging byInduction; Current Electricity; Potential Difference; Resistance7
Electricity and Magnetism CD-ROM (Windows/Macintosh) Activity sheets Preview clip online Correlates to the National Science Education Standards developed by the National Academies of Scienceand Project 2061 Benchmarks for Science Literacy from the American Association for the Advancement ofScience. Item # 10267This program examines the principles of electricity and magnetism and gives students insight intothis fascinating topic, covering such subjects as: static electricity; attraction/repulsion; currentelectricity and electrical circuits; measuring electricity—current, voltage, meters; electrical calculations; magnetism—materials, fields, rules, Earth’s field; field around a current-carrying wire; thelink between electricity and magnetism—induction. A Cambridge Educational Production.The Generation of Electricity VHS/DVD-R Recommended by Science Books & Films Item # 2621The basic principle of electromagnetic generation of electric current is demonstrated in the laboratory; the principles behind the rather complicated construction of AC and DC generators iselucidated by means of a single coil; the use of slip rings and commutators is demonstrated; anda demonstration shows the relationship between the amounts of mechanical energy input in agenerator and the electrical energy output. Sequences at a 2,000-megawatt coal-fired generatordemonstrate that the same basic principles are operative, but the processes in a large industrialelectricity generator are far more complex. Part of the series Physics in Action. (19 minutes)Understanding Electricity VHS/DVD-R Preview clip online Item # 11937From the lighting of homes to the beating of a heart, electricity is an integral and fundamentalforce in human life. In this program, a variety of experts discuss the study and wide-ranging usesof this pervasive phenomenon, from the physics of motors and neon lights to the output of theHoover Dam. Engaging computer graphics are used to explain voltage, amps, and watts. Dr.Martin Uman of the University of Florida Lightning Research Lab conducts modern versions ofthe experiment Ben Franklin made famous. Dr. Hugh Calkins, Director of Electrophysiology atJohns Hopkins Hospital, discusses innovations in defibrillators that can now be installed in thepatient. A Discovery Channel Production. 1997. (53 minutes)8
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Describe the difference between a series circuit and a parallel circuit Define the term series-parallel circuit Explain the function of a hot leg circuit Describe the basic purpose of a ground leg circuit List the basic rules relating to the operation of series and parallel circuits Explain the purpose of
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Ohm ’s Law Ohm's law states that, in an electrical circuit, the current passing through most materials is directly proportional to the potential difference applied across them. 3-1—3-3: Ohm ’s Law Formulas There are three forms of Ohm’s Law: I V/R V IR R V/I where:File Size: 1MBPage Count: 40Explore furtherOhm's Law Quiz MCQs with Answers Ohm Lawohmlaw.comOhm’s Law Worksheet - Basic Electricity - All About Circuitswww.allaboutcircuits.comohms law worksheet - TeachEngineeringwww.teachengineering.orgOhm’s Law Worksheet - Richmond County School Systemwww.rcboe.orgOhm's Law with Examples - Physics Problems with Solutions .www.problemsphysics.comRecommended to you b
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Ohm’s Law Together, voltage, current and resistance comprise Ohm’s Law. Ohm’s Law is an important equation for electricians. By using a DMM, they can establish values for the three variables which help in diagnosing electrical problems. Ohm’s La
DC Circuits . Part 3. Combination Circuits. We have learned about the series circuit and the parallel circuit. Both circuits can be examined by the use of Ohm’s Law. Let’s now combine the two circuits to build a more complex circuit. This type of circuit will be called a series/parallel circuit or a combination circuit. Ohm’s Law
