Download ELT 107 DC Principles of Electricity

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:
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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.
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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
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DC Principles of Electricity
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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
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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
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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
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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
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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
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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
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COURSE CONTENT OUTLINE
MODULE A – BATTERY CONSTRUCTION AND USE
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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
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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
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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
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Cognitive
Total
Performance
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