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Alabama Department of Postsecondary Education Representing Alabama’s Public Two-Year College System ELT 107 DC Principles of Electricity II Plan of Instruction Effective Date: 2005 Version Number: 2005-1 COURSE DESCRIPTION This course provides an advanced study of battery corrections and applications, electrical conduction in liquids and gases, use of watt-meters, oscilloscopes, wheatstone bridge and other meter in testing electronic components; principles and use of DC ground circuits, DC magnetic and electromagnetic principles, Lenz’s Farady’s Law; basic DC relays and motors. Students are prepared to analyze advanced circuit applications, solve difficult problems using meter measurements, and understand relay and motor applications. This course also provides hands on laboratory experiments to analyze, apply, and troubleshoot advanced circuits. Emphasis is placed on test instruments use to measure and troubleshoot advanced circuits using relays, motors, and related equipment. This course supports CIP code 46.0302. CREDIT HOURS (applicable if entire course is taught in a career/technical education degree or non- degree program) Theory Lab Total 2 credit hours 1 credit hour 3 credit hours NOTE: Theory credit hours are a 1:1 contact to credit ratio. Colleges may schedule lab hours as manipulative (3:1 contact to credit hour ratio) or experimental (2:1 contact to credit hour ratio). DC Principles of Electricity ELT 107 PREREQUISITE COURSES ELT 108 or permission of the instructor CO-REQUISITE COURSES Determined by college unless stated otherwise. INSTRUCTIONAL NOTE: Foundational academic skills in General Math such as integers, percents, ratio and proportions, metric system and linear equations and Technical Writing such as research, organization, composition, documentation, and report presentation are used throughout this discipline. INDUSTRY COMPETENCIES: Construct and use batteries Use advanced test equipment for measurements Distinguish between various types of magnets Explain the principles of DC generators and relays Construct and operate DC motor circuits GENERAL INSTRUCTIONAL OBJECTIVES: The cognitive objective for this course is for each student to comprehend foundational knowledge of advanced DC principles. The performance objective of this course is for each student to apply foundational knowledge of advanced DC principles in a simulated environment. Alabama College System 2 DC Principles of Electricity ELT 107 INDUSTRY COMPETENCIES/STUDENT PERFORMANCE OBJECTIVES: Unless otherwise indicated, evaluation of student’s attainment of cognitive and performance objectives is based on knowledge gained from this course. During performance evaluations, students will be provided necessary tools, equipment, materials, specifications, and any other resources necessary to accomplish the task. Specifications may be in the form of, but not limited to, manufacturer’s specifications, technical orders, regulations, national and state codes, certification agencies, locally developed lab assignments, or any combination of specifications. MODULE A – BATTERY CONSTRUCTION AND USE INDUSTRY COMPETENCIES A1.0 Construct and use batteries (3b) STUDENT PERFORMANCE A1.1 Correctly label the basic parts of a battery A1.2 Correctly connect batteries for increasing voltage and current A1.3 Demonstrate methods for safely connecting and testing batteries ENABLING OBJECTIVES/KEY INDICATORS A1.1.1 Identify the parts of a battery A1.1.2 Explain the construction of primary cell batteries A1.1.3 Explain the construction of secondary cell batteries A1.1.4 Explain the chemical action in charging and discharging a battery A1.1.5 Explain the difference between primary and secondary cell batteries A1.2.1 Explain how cells can be connected to increase the current capacity or voltage output of a battery A1.2.2 Describe the differences between voltage sources and current sources A1.2.3 Explain the function of battery in an UPS or Uninterruptible Power Supply A1.2.4 Identify the different types of batteries as used with different loads A1.2.5 Define voltage, current, and ampere-hour capacity A1.2.6 Determine voltage, current, and ampere-hour capacity of batteries A1.3.1 Describe safety procedures for use with lead-acid type batteries A1.3.2 Explain the hazards involved with batteries Alabama College System KSA Indicator a b b B A B A b A A b b A 3 DC Principles of Electricity ELT 107 MODULE B – USE OF ADVANCED TEST EQUIPMENT INDUSTRY COMPETENCIES B1.0 Use advanced test equipment for measurements (2b) STUDENT PERFORMANCE B1.1 Correctly use ammeters, voltmeters, and wattmeters for electrical measurements B1.2 Use oscilloscope to obtain DC measurements not available with traditional meters B1.3 Demonstrate use of DC electronic and high voltage test equipment KSA Indicator ENABLING OBJECTIVES/KEY INDICATORS B1.1.1 Describe how the capacity of an ammeter may be increased B1.1.2 Describe the correct method for using and connecting the wattmeter and current transformer B1.1.3 Explain the need for ammeter shunts B1.2.1 Describe the correct method for using oscilloscope for accurate measurements B1.2.2 Explain the use of the wheatstone bridge to measure values of resistance, inductance, and capacitance accurately B1.3.1 Explain the proper use of meters when testing DC electronic components B1.3.2 Explain proper safety procedures when measuring high voltage DC values using probes. B1.3.3 Explain the function of RC & RL time constants in a DC circuit B1.3.4 Describe and explain the difference between earth ground, chassis ground, and common ground B1.3.5 Explain the problems associated with poorly grounded circuits b b A b b b b b A B MODULE C – INTRO TO THE PRINCIPLES OF MAGNETISM INDUSTRY COMPETENCIES C1.0 Distinguish between various types of magnets (2B) STUDENT PERFORMANCE C1.1 Select and properly use permanent and electromagnets C1.2 Check coils, motors, and generator windings Alabama College System 4 DC Principles of Electricity ELT 107 KSA Indicator ENABLING OBJECTIVES/KEY INDICATORS C1.1.1 Explain the properties of permanent magnets C1.1.2 Describe the difference between the axis poles of the earth and magnetic poles of the earth C1.1.3 Describe the different systems to measure magnetism C1.1.4 Define terms used to describe magnetism and magnetic quantities C1.1.5 Explain magnetic lines of flux and basic laws of magnetism C1.1.6 Explain the 3 basic types of magnetic material C1.1.7 Define terms as related to magnetism C1.1.8 Describe the construction of electromagnet C1.1.9 Explain the means of varying the strength of an electromagnet by ampere turns value C1.1.10 Identify the types of electromagnet core materials C1.1.11 Explain and demonstrate how to determine the polarity of an electromagnet C1.1.12 Explain and demonstrate how an object may be magnetized and demagnetized C1.2.1 Describe the methods of magnetic shielding C1.2.2 Explain the Hall Effect as pertaining to electromagnets C1.2.3 Explain what is meant by motor action between two magnetic fields A B A A A A A b b a b b B B B MODULE D – PRINCIPLES OF DC GENERATION AND USE OF RELAYS INDUSTRY COMPETENCIES D1.0 Explain the principles of DC generators and relays (2B) STUDENT PERFORMANCE D1.1 Cut magnetic flux to produce an induced voltage D1.2 Calculate the amount of voltage produced D1.3 Construct a circuit to show how a relay operates and is used ENABLING OBJECTIVES/KEY INDICATORS D1.1.1 Explain the application of Lenz’s and Farady’s Laws D1.1.2 Explain how a magnetic flux cutting across a conductor can produce an induced voltage D1.2.1 Calculate the amount of induced voltage across the ends of an conductor using Farady’s Law D1.3.1 Explain the construction and operation of a basic relay D1.3.2 List and explain some important relay ratings D1.3.3 Describe the basic applications of relays Alabama College System KSA Indicator b b b b A A 5 DC Principles of Electricity ELT 107 MODULE E – MOTOR PRINCIPLES INDUSTRY COMPETENCIES E1.0 Construct and operate a DC Motor (3b) STUDENT PERFORMANCE E1.1 Demonstrate proper use of a DC motor operation E1.2 Vary the speed of a DC motor ENABLING OBJECTIVES/KEY INDICATORS E1.1.1 Explain how electromagnetism is used in the basic operation of a simple DC motor E1.1.2 Describe how the strength of an electromagnetic field affects the speed of a DC motor E1.2.1 Explain the different types of DC motors E1.2.2 Explain the Right Hand Motor Rule KSA Indicator A B A A COURSE CONTENT OUTLINE MODULE A – BATTERY CONSTRUCTION AND USE Primary and secondary types Increasing current or voltage Uninterruptible power supplies Battery safety procedures Battery applications MODULE B – USE OF ADVANCED TEST EQUIPMENT Use of voltmeters, ammeters, and wattmeters Measurements using oscilloscopes Testing DC Electronic Components Measuring high voltage DC RC and RL time constants in DC circuits DC grounding applications MODULE C – INTRODUCTION TO PRINCIPLES OF MAGNETISM Properties of permanent magnets Magnetic poles Measuring magnetic quantities Electromagnetic construction Determining polarity of an electromagnet Magnetizing and demagnetizing materials. Hall effect electromagnet principles Magnetic fields in motors Alabama College System 6 DC Principles of Electricity ELT 107 MODULE D – PRINCIPLES OF DC GENERATION AND RELAYS Magnetic flux principles Producing an induced voltage Principles of Lenz’s and Faroday’s Lays Construction and operation of relays Relay applications and rating MODULE E– DC MOTOR PRINCIPLES Electromagnetic motor operation Simple DC motor construction Series, Shunt, and compound motor types Right hand motor rule principle Alabama College System 7 DC Principles of Electricity ELT 107 RECOMMENDED METHODS OF EVALUATION: The table of specifications below identifies the number of enabling objectives/key indicators per cognitive domain level of learning (Knowledge, Comprehension, Application) per module. Instructors should develop a minimum of 1-3 test questions per Knowledge Level of Learning, 2-4 test questions per Comprehension Level of Learning, and 5-6 questions per Application Level Learning. Instructors should use the following test item types for each level of learning: Knowledge: Multiple Choice, Alternative Response test items (true/false or yes/no) Comprehension: Multiple Choice, Short answer Application: Multiple Choice, Short Answer Exercises The table of specifications below also identifies the number of objectives per module. The instructor should ensure each student meets the performance and standards published in each objective. TABLE OF SPECIFICATIONS Domain of Cognitive Domain Learning/ Knowledge Comprehension Application Content Module A Module B Module C Module D Module E Number of indicators per level Alabama College System Total Cognitive Total Performance 8