\"How to Learn Electrical Circuit Diagrams\" starts with understanding the basics of electrical circuit diagrams, and introduces the basic components and devices that must be mastered, electrical diagrams, electronic application circuit diagrams, building electrical engineering diagrams, common low-voltage electrical appliances and control circuit diagrams, electrical measurement circuit diagrams, power supply and distribution system electrical diagrams, etc. The book has detailed principles, novel circuits, exquisite illustrations, valuable information, and is popular and practical. Publisher\'s Notes Preface Part I \"Learning\" - Lay a good foundation and be prepared Chapter 1 Start by understanding the basics of electrical circuit diagram reading 3 1.1 The basic structure of electrical diagrams 3 1.1.1 General regulations on the size of drawings 3 1.1.2 The composition of electrical diagrams 8 1.2 Electrical graphic symbols 8 1.2.1 The structure of common components and electrical graphic symbols 8 1.2.2 Text symbols 10 1.2.3 Project code 11 1.2.4 Circuit label 13 1.3 Recognize common electrical diagrams 13 1.3.1 Types of electrical diagrams 13 1.3.2 Types of weak current circuit diagrams 14 1.3.3 Types of strong current circuit diagrams 15 1.4 I\'ll do it - Master the basics 18 Exercise 1 18 Chapter 2 Basic components and devices that must be mastered 20 2.1 Basic electronic components 20 2.1.1 Resistors 20 2.1.2 Capacitors 22 2.1.3 Inductors and transformers 22 2.1.4 Diodes 24 2.1.5 Transistors 25 2.2 Common low-voltage electrical appliances 25 2.2.1 Low-voltage fuses 25 2.2.2 Switches and master control appliances 27 2.2.3 Low-voltage circuit breakers (automatic switches) 31 2.2.4 AC contactors 33 2.2.5 Relays 35 2.3 I’ll do it — Understanding components 40 Exercise 2 40 Part II “Thinking” — Solving problems and removing obstacles Chapter 3 Electrical Diagram Reading 45 3.1 Requirements and steps for electrical diagram reading 45 3.1.1 Basic requirements for reading diagrams 45 3.1.2 Basic steps for reading diagrams 46 3.2 Basic methods for weak-current diagram reading 47 3.2.1 Requirements for reading circuit diagrams 47 3.2.2 Basic methods for weak-current diagram reading 50 3.3 3.3.1 Key points and steps for reading electrical control circuit diagrams 51 3.3.2 Knowledge, skills and precautions for reading electrical control circuit diagrams 53 3.4 Let me do it—clearing obstacles 54 Exercise 3 54 Part III “Practice”—apply what you have learned and overcome difficulties Chapter 4 Electronic Application Circuit Diagram Reading 57 4.1 Resistor Application Circuit Diagram Reading 57 4.1.1 Resistor Series Voltage Division 57 4.1.2 Resistor Parallel Current Division 59 4.2 Capacitor Application Circuit Diagram Reading 60 4.2.1 Capacitor Filtering and Decoupling 60 4.2.2 Capacitor Coupling and Bypass 61 4.2.3 X-Capacitor, Y-Capacitor 61 4.2.4 Tuning and Resonant Capacitors 62 4.3 Inductor and Transformer Application Circuit Diagram Reading 62 4.3.1 Inductor Filtering 62 4.3.2 Inductor Resonance 62 4.3.3 Common mode and differential mode of inductors 63 4.3.4 Application of transformers 64 4.4 Diode application circuit diagram reading 65 4.4.1 Application of rectifier diodes and rectifier bridges 65 4.4.2 Application of voltage regulator diodes 67 4.4.3 Application of protection diodes 67 4.4.4 Application of switching diodes 68 4.5 Transistor application circuit diagram reading 68 4.5.1 Amplification application of transistors 68 4.5.2 Switching application of transistors 70 4.6 Light emitting diode application circuit diagram reading 71 4.6.1 Light emitting diode power indicator circuit 71 4.6.2 LED digital tube application circuit 72 4.7 Example diagram reading guide 74 4.7.1 Block diagram reading skills 74 4.7.2 Circuit diagram reading skills 76 4.7.3 Printed circuit diagram reading skills 78 4.7.4 4.7.5 Diagram reading 2 — Schematic diagram of series-connected voltage-stabilized power supply circuit 78 4.7.6 Diagram reading 3 — Schematic diagram of power amplifier power supply circuit 81 4.7.7 Diagram reading 4 — Schematic diagram of thyristor dimming circuit for lighting lamp 81 4.7.8 Diagram reading 5 — Block diagram and schematic diagram of electronic fluorescent lamp circuit 83 4.7.9 Diagram reading 6 — Schematic diagram of fire emergency light circuit 85 4.8 Let me do it — Electronic circuit diagram reading 86 Exercise 4 86 Chapter 5 Architectural electrical engineering drawing reading 88 5.1 Classification of architectural electrical construction plan drawings 88 5.2 Steps for reading architectural electrical drawings 89 5.3 Key points for reading electrical lighting construction drawings 90 5.4 Marking methods for conductors and electrical equipment 91 5.4.1 Marking methods for conductors 91 5.4.2 Marking methods for electrical equipment 92 5.4.3 Identification and marking of insulated wires 92 5.5 Reading home electrical diagrams 95 5.5.1 Reading lighting circuit schematics 95 5.5.2 Reading electrical plan diagrams 97 5.5.3 Reading electrical system diagrams 99 5.5.4 Representation of lighting wiring 104 5.5.5 Reading standard floor socket plan diagrams 105 5.5.6 Reading standard floor lighting plan diagrams 106 5.5.7 Reading office and laboratory socket and lighting engineering diagrams 107 5.6 Reading building security system electrical diagrams 115 5.6.1 Reading building intercom system electrical diagrams 115
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