Spend your study time wisely
As you advance from student to apprentice to journeyman status, you
log a lot of study hours. Make the most of those hours with this
fully updated, sharply focused self-study course. It contains
everything you need to know about electrical theory and
applications, clearly defined and logically organized, with
illustrations for clarity and review questions at the end of each
chapter to help you test your knowledge.
* Understand electron theory and how electricity affects matter
* Recognize applications for both alternating and direct
current
* Comprehend Ohm's Law and the laws governing magnetic
circuits
* Learn from detailed drawings and diagrams
* Explore trigonometry and alternative methods of calculation
* Identify instruments and measurements used in electrical
applications
* Apply proper grounding and ground testing, insulation testing,
and power factor correction
Autorentext
Paul Rosenberg is a master electrician with extensive experience in all aspects of the industry. An instructor at Iowa State University, he has written for all the major electrical industry publications. He is also the author of Audel Questions and Answers for Electrician's Examinations, 14th Edition.
Zusammenfassung
Spend your study time wisely
As you advance from student to apprentice to journeyman status, you log a lot of study hours. Make the most of those hours with this fully updated, sharply focused self-study course. It contains everything you need to know about electrical theory and applications, clearly defined and logically organized, with illustrations for clarity and review questions at the end of each chapter to help you test your knowledge.
* Understand electron theory and how electricity affects matter
* Recognize applications for both alternating and direct current
* Comprehend Ohm's Law and the laws governing magnetic circuits
* Learn from detailed drawings and diagrams
* Explore trigonometry and alternative methods of calculation
* Identify instruments and measurements used in electrical applications
* Apply proper grounding and ground testing, insulation testing, and power factor correction
Inhalt
Introduction xiii
Chapter 1 Electricity and Matter 1
Elements, Atoms, Molecules, and Compounds 1
Electron Theory 3
Electric Current 9
Insulators and Conductors 11
Questions 12
Chapter 2 Units and Definitions 13
Fundamental and Derived Units 13
Definitions 15
Magnetic Units 17
Temperature Units 18
Questions 18
Chapter 3 Electrical Symbols 21
Graphic Electrical Wiring Symbols 21
0.1 Drafting Practices Applicable to Graphic Electrical Wiring Symbols 21
0.2 Explanation Supplementing the Schedule of Symbols 23
List of Symbols 27
1.0 Lighting Outlets 27
2.0 Receptacle Outlets 28
3.0 Switch Outlets 31
4.0 Signaling System Outlets: Institutional, Commercial, and Industrial Occupancies 31
5.0 Signaling System Outlets: Residential Occupancies 36
6.0 Panelboards, Switchboards, and Related Equipment 37
7.0 Bus Ducts and Wireways 38
8.0 Remote Control Stations for Motors or Other Equipment* 39
9.0 Circuiting 39
10.0 Electric Distribution or Lighting System, Underground 40
11.0 Electric Distribution or Lighting System Aerial 41
Arrester, Lightning Arrester (Electric Surge, etc.) Gap 42
Battery 43
Circuit Breakers 43
Circuit Return 45
Coil, Magnetic Blowout* 45
Contact, Electrical 46
Contactor 48
Machine, Rotating 49
Meter Instrument 53
Path, Transmission, Conductor, Cable Wiring 55
Polarity Symbol 56
Switch 57
Transformer 58
Chapter 4 Magnets and Magnetic Fields 63
Magnetic Poles 63
Magnetic and Nonmagnetic Substances 64
The Earth as Magnet 64
Magnetic Lines of Force 65
Molecular Theory of Magnetism 66
Strength of a Magnet 68
Lifting Power of a Magnet 68
Questions 69
Chapter 5 Ohm's Law 71
Statement of Ohm's Law 71
Analogy of Ohm's Law 71
Illustrations of Ohm's Law 72
Ohm's Law and Power 74
The Ohm's Law Circle 74
Formulas 75
Ohm's Law 75
Power in Watts 75
Questions 76
Chapter 6 Capacitors 77
Capacitance 83
Capacitance in Series and Parallel 84
Capacitance in Other Than Regular Capacitors 86
Formulas 87
Questions 87
Chapter 7 Resistance 89
Skin Effect 97
Conductivity 97
Voltage-Drop Calculation 99
Measuring Conductors 100
Questions 101
Chapter 8 Resistance in Series and Parallel 103
Resistances in Series 103
Resistances in Parallel 104
Series-Parallel Circuits 107
Questions 109
Chapter 9 Electrolysis 111
Terminology 111
Chemistry of Electrolysis 112
Electroplating 114
Corrosion 114
Questions 116
Chapter 10 Primary and Secondary Cells 117
The Voltaic Cell 117
Primary Cells 119
Secondary Cells 122
Questions 127
Chapter 11 Electromagnetism 129
Galvanoscope 134
Solenoids 135
Questions 136
Chapter 12 Laws Governing Magnetic Circuits 139
Strength of a Magnetic Pole 141
Intensity of Magnetizing Force 142
Magnetic Reluctance 142
Formulas 149
Questions 149
Chapter 13 Work, Power, Energy, Torque, and Efficiency 151
Torque 155
Prony Brake 156
Formulas 158
Questions 158