1. 1 Composition and basic concept II of the circuit
Composition and circuit diagram of 1. 1. 1 circuit 2
Basic physical quantity 1. 1.2 Circuit 4
1. 1.3 basic elements of the circuit 7
1.2 Basic Laws of Circuits 12
1.2. 1 ohm's law 12
Kirchhoff law 15
Analysis and calculation of 1.3 circuit 17
1.3. 1 branch current method 17
1.3.2 Calculation of potentials at various points in the circuit 19
* 1.3.3 Thevenin Theorem 20
1.4 Basic knowledge of common electrical instruments 22
1.4. 1 Classification of Common Electrical Appliances 22
1.4.2 Model and identification of electrical instruments 23
1.4.3 Selection, use and maintenance of common electrical instruments 25
1.5 skills training 27
1.5. 1 Use of multimeter 27
1.5.2 Use of megohmmeter 30
Verify Kirchhoff's Law 32
Chapter 34 Overview
Thinking and practice 35
Chapter 2 AC circuit 37
2. 1 AC 38 basic knowledge
2. 1. 1 the concept of alternating current 38
2. 1.2 Basic knowledge of sinusoidal alternating current 40
2. 1.3 addition and subtraction of sinusoidal alternating current with the same frequency 42
2.2 Single-phase AC Circuit 43
2.2. 1 single parameter sine AC circuit 44
2.2.2 RL series circuit 49
2.3 Three-phase AC Circuit 54
2.3. 1 Three-phase AC power supply 54
2.3.2 Connection of three-phase load 56
2.3.3 Three-phase power supply 58
2.4 Skills training 59
2.4. 1 three-phase load star connection 59
2.4.2 Triangle connection of three-phase load 6 1
Overview of this chapter 62
Thinking and Practice 63
Chapter 3 Electromagnetic Induction and Electromagnetic Device 65
3. 1 magnetic phenomena and electromagnetic induction 66
3. 1. 1 magnetic phenomenon 66
3. 1.2 Current magnetic field and its influence on current 68
3. 1.3 electromagnetic induction phenomenon 70
3.2 Electromagnet and Magnetic Circuit 72
3.2. 1 Electromagnets and ferromagnetic materials 73
3.2.2 Magnetic Circuit and Basic Knowledge 74
3.3 Common electromagnetic devices 75
Transformer 75
Autotransformer 77
Transformer 78
Electromagnetic relay 80
3.4 Skills Training 8 1
Abstract of this chapter 83
Thinking and Practice 84
Chapter 4 Motor and Electrical Control 85
4. 1 AC motor 86
4. 1. 1 Structure and working principle of three-phase AC asynchronous motor 86
4. 1.2 Starting and speed regulation of three-phase AC asynchronous motor 92
4. 1.3 Structure and working principle of three-phase AC synchronous motor 94
4.2 DC car 96
4.2. Structure and working principle of1DC motor 96
4. 2. 2 DC motor starting and speed regulation 98
4.3 control motor 100
4.3. 1 servo motor 100
Stepper motor 100
4.4 Common low-voltage appliances 10 1
4.5 control of three-phase asynchronous motor 108
4.5. 1 forward and reverse control circuit of three-phase asynchronous motor 108
4.5.2 step-down starting circuit of three-phase asynchronous motor11/
4.6 generator 1 13
4.6. 1 characteristics of three-phase AC synchronous generator 1 13
4.6.2 structure and working principle of three-phase alternator 1 14
4.7 skills training 1 16
4.7. 1 Simple test and operation test of three-phase asynchronous motor 1 16
4.7.2 Three-phase asynchronous motor inching and continuous operation control experiment 120
4.7.3 Forward and reverse control experiment of three-phase asynchronous motor 123
Summary of this chapter 124
Thinking and Practice 125
Chapter V Fundamentals of Analog Electronic Circuits 126
5. 1 Basic knowledge of semiconductors 127
5. 1. 1 Introduction to semiconductor characteristics 127
5.1.2 formation and characteristics of pn junction 128
5.2 crystal diode and its application 129
5.2. 1 crystal diode structure, symbols and characteristics 129
5.2.2 diode 132 application circuit
5.3 transistors and their applications 136
5.3. Structure, symbol and characteristics of1transistor 136
5.3.2 Working state and main parameters of transistor 138
5.3.3 Application of Triode Series Voltage Regulator Circuit 14 1
5.4 transistor basic amplifier circuit 142
5.4. 1 *** emitter single-tube amplifier circuit 5438+042
5.4.2 Voltage-dividing stable operating point bias circuit 144
5.4.3 Multistage amplifier and negative feedback amplifier 145
5.4.4 Low frequency power amplifier 148
5.5 Direct coupling amplifier and integrated operational amplifier 150
5.5. 1 direct coupling amplifier circuit 150
5.5.2 Differential amplifier circuit 15 1
5.5.3 integrated operational amplifier 152
*5.6 sine wave oscillator 155
*5.7 thyristor and its application 158
5.8 Skills Training 159
5.8. 1 Usage of General Electronic Instruments 159
5.8.2 Experiment of single-phase bridge rectifier capacitor filter circuit 163
Summary of this chapter 165
Thinking and Practice 166
Chapter VI Fundamentals of Digital Electronic Circuits 167
6. 1 Basic knowledge of digital circuits 168
6. 1. 1 digital signal and digital circuit 168
6. 1.2 digital circuit analysis method 170
6.2 Basic Logic Gate 172
6.2. 1 logic and gate circuit 173
6.2.2 OR logical AND OR gate circuit 174
6.2.3 Non-logical NAND gate 175
6.2.4 Compound Logic Gate 176
6.3 combinational logic circuit 177
6.3. 1 encoder 177
6.3.2 Decoder and display equipment 178
6.4 flip-flops and sequential logic circuits 180
1 trigger 180
6.4.2 Counter 184
6.4.3 Register 186
6.4.4 Integrated Circuits and Their Applications 187
6.5 skills training 19 1
6.5. 1 detection integrated circuit 19 1
6.5.2 Dimming circuit of automobile lighting ceiling lamp 194
6.5.3 Automobile Flash Buzzer Circuit 194
Summary of this chapter 196
Thinking and Practice 196
Chapter 7 sensor basics 198
7. 1 sensor composition and classification 199
7.2 Introduction of Vehicle Sensors 20 1
7.2. 1 resistance sensor and its application 20 1
7.2.2 Photosensitive element and photoelectric sensor 203
7.2.3 Potential Sensor and Its Application 204
7.2.4 Introduction of Other Sensors 206
Chapter 207 Summary
Thinking and Practice 208
Chapter VIII Manual Welding Foundation 209
8. 1 Basic knowledge of manual welding 2 10
8. 1. 1 manual welding tool 2 10
8. 1.2 Manual welding method 2 12
8.2 Skills Training 2 15
8.2. 1 welding wire 2 15
8.2.2 Welding of printed circuit boards 2 17
Summary of this chapter 2 19
Thinking and practice 2 19
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