Electrotechnical

"Electrical Technology" is a basic technical course for undergraduate students in non-electrical majors in colleges and universities. The main purpose of the course is to introduce the basic principles and applications of electrical engineering based on students' needs for electrical engineering knowledge in this major. Content includes: basic theory and analysis methods of circuits, circuit simulation tools (Spice and Multisim), principles and applications of electric motors, relay-contactor control and programmable controllers (PLC), etc.

Frequently Asked Questions
What are the teaching materials and tutorial materials for this course?
The textbook is "Basics of Electrical and Electronic Technology and EDA" (Part 1) edited by Duan Yusheng and Wang Yandan, published by Tsinghua University Press in January 2015; the tutoring material is "Study Guide for Electrical and Electronic Technology" edited by Wang Yandan and Duan Yusheng, Tsinghua University Press Published in 2012.
Which experimental instruction book is it?
The experimental guide is "Electrical Technology and Electronic Technology Experiment Guide" edited by Wang Yandan and Duan Yusheng, published by Tsinghua University Press in 2012.
What kind of circuit simulation software is introduced in the course?
There are many kinds of circuit simulation software, but they are all expanded versions with Spice as the core. Therefore, this book focuses on Spice and provides corresponding free application software for readers to learn Spice. After mastering the basic content of Spice, you will use the circuit simulation software Multisim to perform circuit simulation. This software is commercial software and needs to be installed by the reader. In addition, according to the reader's conditions, you can also choose other Spice-based circuit simulation software, such as Tina or Pspice.
Why does this course spend a certain amount of time introducing Spcie? What is the relationship between Spice and traditional teaching content?
Spice is the most basic software tool for electronic design automation. This course introduces the circuit simulation tool Spice after finishing the DC circuit, and adopts the "combined use, step by step" method in subsequent content to introduce the basic knowledge of Spice into the course, which can avoid lengthy and cumbersome explanations. Spice can also be organically combined with traditional teaching content to make it easier for readers to learn.
Which type of PLC is used as an example to introduce programmable controllers?
Programmable controllers (PLC) are now an indispensable part of electrical technology teaching. This course takes Siemens S7-200 series PLC as the introduction object. Because different PLC products are similar in terms of programming statements and usage methods, after mastering the usage of S7-200, readers can easily switch to learning and using other brand products.
How is Multisim software introduced in the course?
Multisim is a circuit simulation application software based on Spice. Only after understanding Spice can you use Multisim well. This course focuses on using Multisim. Its operation method will be briefly introduced, but readers need to do more simulation exercises to use it well.

• Chapter 1：Circuit variables and directions (10 minutes and 29 seconds)

• Chapter 2：Kirchhoff's Law (10 minutes and 17 seconds)

• Chapter 3：circuit components (8 minutes and 48 seconds)

• Chapter 4：Equivalent interchange of two power supplies (7 minutes and 1 seconds)

• Chapter 5：branch current method (6 minutes and 51 seconds)

• Chapter 6：Nodal potential method (10 minutes and 22 seconds)

• Chapter 7：superposition theorem (7 minutes and 28 seconds)

• Chapter 8：Thevenin's Theorem of Equivalent Power Source Theorem (8 minutes and 6 seconds)

• Chapter 9：Equivalent power supply theorem Norton's theorem (5 minutes and 36 seconds)

• Chapter 10：Analytical Methods for Circuits Containing Controlled Sources (16 minutes and 30 seconds)

• Chapter 11：SPICE circuit file (14 minutes and 22 seconds)

• Chapter 12：element statement (13 minutes and 8 seconds)

• Chapter 13：DC analysis and output statements (12 minutes and 30 seconds)

• Chapter 14：Subcircuit and model statements (12 minutes and 56 seconds)

• Chapter 15：How to use Aim-spice (10 minutes and 56 seconds)

• Chapter 16：The concept of sinusoidal AC circuit (14 minutes and 29 seconds)

• Chapter 17：Phasor representation of sinusoidal quantities (16 minutes and 52 seconds)

• Chapter 18：Pure resistive AC circuit (9 minutes and 58 seconds)

• Chapter 19：Purely inductive AC circuit (10 minutes and 34 seconds)

• Chapter 20：Pure capacitive AC circuit (9 minutes and 22 seconds)

• Chapter 21：RLC series AC circuit_01 (12 minutes and 51 seconds)

• Chapter 22：RLC series AC circuit_02 (10 minutes and 2 seconds)

• Chapter 23：General analysis methods for AC circuits (18 minutes and 51 seconds)

• Chapter 24：Improvement of power factor (11 minutes and 18 seconds)

• Chapter 25：Sine signal source and .tran analysis statement (10 minutes and 23 seconds)

• Chapter 26：series resonance (12 minutes and 48 seconds)

• Chapter 27：parallel resonance (16 minutes and 57 seconds)

• Chapter 28：Frequency characteristics of the circuit (15 minutes and 6 seconds)

• Chapter 29：ac communication scanning analysis statements and their applications (9 minutes and 42 seconds)

• Chapter 30：Series resonance experiment of RLC circuit (29 minutes and 2 seconds)

• Chapter 31：Three-phase AC power (10 minutes and 45 seconds)

• Chapter 32：Three-phase circuit analysis with load star connection (13 minutes and 2 seconds)

• Chapter 33：Three-phase circuit analysis with load delta connection (5 minutes and 31 seconds)

• Chapter 34：Three-phase circuit power (14 minutes and 26 seconds)

• Chapter 35：Common sense about safe electricity use (20 minutes and 23 seconds)

• Chapter 36：Use SPICE to analyze three-phase circuits (12 minutes and 25 seconds)

• Chapter 37：Three-phase circuit experiment (18 minutes and 14 seconds)

• Chapter 38：Decomposition of non-sinusoidal periodic AC signals (9 minutes and 23 seconds)

• Chapter 39：Analysis and calculation of non-sinusoidal periodic AC circuits (12 minutes and 58 seconds)

• Chapter 40：RMS and average power (6 minutes and 16 seconds)

• Chapter 41：Use Spice to analyze non-sinusoidal AC circuits (8 minutes and 9 seconds)

• Chapter 42：Path changing theorem and determination of initial value (21 minutes and 16 seconds)

• Chapter 43：Classic analysis methods of transition process (12 minutes and 8 seconds)

• Chapter 44：Three-factor analysis method of transition process (19 minutes and 47 seconds)

• Chapter 45：Superposition analysis method of transition process (11 minutes and 22 seconds)

• Chapter 46：Differential circuit, integral circuit and RC circuit under pulse excitation (18 minutes and 3 seconds)

• Chapter 47：First-order circuit containing multiple energy storage elements_01 (14 minutes and 3 seconds)

• Chapter 48：First-order circuit containing multiple energy storage elements_02 (15 minutes and 14 seconds)

• Chapter 49：Use Spice to analyze the transition process of the circuit (18 minutes and 31 seconds)

• Chapter 50：Transition process of RC circuit (16 minutes and 58 seconds)

• Chapter 51：Physical quantities of magnetic field and magnetic materials (10 minutes and 29 seconds)

• Chapter 52：Ampere's circuit law and Ohm's law for magnetic circuits (5 minutes and 30 seconds)

• Chapter 53：AC core coil (8 minutes and 53 seconds)

• Chapter 54：Transformer results and working principle (11 minutes and 41 seconds)

• Chapter 55：Transformer ratings and special transformers (6 minutes and 29 seconds)

• Chapter 56：Use SPICE to analyze transformer circuits (5 minutes and 28 seconds)

• Chapter 57：Multisim main window components (6 minutes and 49 seconds)

• Chapter 58：Editing and testing of circuit diagrams (12 minutes and 58 seconds)

• Chapter 59：Component library (10 minutes and 23 seconds)

• Chapter 60：Test instrument (9 minutes and 45 seconds)

• Chapter 61：Multisim analysis functions (9 minutes and 36 seconds)

• Chapter 62：Using Multisim to analyze circuit examples (16 minutes and 48 seconds)

• Chapter 63：Preliminary knowledge (4 minutes and 40 seconds)

• Chapter 64：The rotation principle of asynchronous motor (3 minutes and 30 seconds)

• Chapter 65：Structure and working principle of three-phase asynchronous motor (12 minutes and 16 seconds)

• Chapter 66：Mechanical characteristics of three-phase asynchronous motors (8 minutes and 15 seconds)

• Chapter 67：Use of three-phase asynchronous motors (13 minutes and 59 seconds)

• Chapter 68：Introduction to single-phase asynchronous motor (7 minutes and 28 seconds)

• Chapter 69：Commonly used low voltage electrical appliances (8 minutes and 35 seconds)

• Chapter 70：Motor start-stop-stop control and motor protection (5 minutes and 51 seconds)

• Chapter 71：Basic control links (16 minutes and 56 seconds)

• Chapter 72：Comprehensive examples (8 minutes and 9 seconds)

• Chapter 73：Relay-contactor control system experiment (10 minutes and 36 seconds)

• Chapter 74：The composition and working principle of programmable controller (16 minutes and 20 seconds)

• Chapter 75：S7-200 PLC Programming Basics_01 (9 minutes and 45 seconds)

• Chapter 76：S7-200 PLC Programming Basics_02 (15 minutes and 40 seconds)

• Chapter 77：Bit logic instruction_01 (13 minutes and 27 seconds)

• Chapter 78：Bit logic instruction_02 (12 minutes and 21 seconds)

• Chapter 79：Timer instructions and counter instructions (15 minutes and 35 seconds)

• Chapter 80：Design method of small PLC control system (20 minutes and 1 seconds)

• Chapter 81：sequential function chart (21 minutes and 4 seconds)

• Chapter 82：Programming using Sequential Control Relays (SCRs) (15 minutes and 9 seconds)

• Chapter 83：Step7-Microwin window composition (12 minutes and 42 seconds)

• Chapter 84：Step7-Microwin usage example (12 minutes and 38 seconds)