2020 Electric Circuits

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Academic unit or major
Undergraduate major in Information and Communications Engineering
Takagi Shigetaka  Isshiki Tsuyoshi 
Course component(s)
Mode of instruction
Day/Period(Room No.)
Mon7-8(S421)  Thr7-8(S421)  
Course number
Academic year
Offered quarter
Syllabus updated
Lecture notes updated
Language used
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Course description and aims

This course focuses on analyzing electric circuits consisting of sources and linear passive circuit elements, such as resistors, capacitors, inductors, and transformers. Alternating current (AC) sources with sine waves are assumed, which include direct current (DC) sources as a special case when the frequency is set to zero. Topics include AC voltage, current, and power, phasor representation, impedance and admittance, resonant circuits, transformers, network analysis by branch current method, nodal analysis, loop analysis, useful theorems for network analysis, and 2-port networks. By combining lectures and exercises, the course enables students to understand fundamentals of AC circuit analysis.
A wide variety of electric circuits including analog and digital electronic circuits are used in the areas related information and communication technology (ICT). For designing and analyzing such electric circuits, the knowledge that provided in this course must be essential. Moreover some theorems and methods are applicable to analysis of linear electronic circuits and general linear systems. Thus students should be noted that the knowledge acquired through this course would become the basis of ICT studies.

Student learning outcomes

By the end of this course, students will be able to:
1) Understand instantaneous and effective values of physical quantities for describing AC circuits, such as voltage, current, and power, and also represent these quantities by phasors.
2) Calculate impedance and/or admittance.
3) Draw impedance locus and reactance curve of a given circuit.
4) Determine voltages and currents of a given circuit based on Kirchhoff’s laws.
5) Analyze networks by determining voltages and currents based on nodal equations and/or loop equations.
6) Represent an arbitrary circuit consisting of many sources and elements by a simple equivalent circuit.


AC sine wave, phasor, impedance, admittance, resonant circuits, nodal analysis, loop analysis, two-port network

Competencies that will be developed

Specialist skills Intercultural skills Communication skills Critical thinking skills Practical and/or problem-solving skills

Class flow

At the beginning of each class, summary of the previous class and answers to assignments are reviewed. Towards the end of class, students are given exercise problems related to what is taught on that day to solve, and also given assignments as necessary.

Course schedule/Required learning

  Course schedule Required learning
Class 1 Introduction to electric circuits: voltage, current, power Understand physical quantities that describe properties of electric circuits, such as voltage, current, and power.
Class 2 Direct current (DC) circuits: voltage and current sources, resistive circuits Understand current sources and how to analyze networks consisting of DC sources and resistors.
Class 3 Circuit elements: resistors, capacitors, inductors Understand relationship between current and voltage of basic circuit element.
Class 4 Kirchhoff’s laws and basic theorems Understand Kirchhoff's laws and basic theorems including Thevenin's theorem, superposition theorem, etc.
Class 5 Nodal analysis and loop analysis Analyze networks based on nodal equations and loop equations.
Class 6 Parmeters expressing alternative current signals Understand alternating current waveforms, especially sinousoidal waves and their parameters.
Class 7 AC sine waves and steady-state responses of circuits elements Understand relationship between current and voltage of basic AC circuit element.
Class 8 Sinousoidal waves and phasors Represent a sine wave by a complex number, or a vector called phasor.
Class 9 Analyses of LCR circuits Unerstand Analyses of LCR circuits including RC circuits, LR circuits, etc.
Class 10 Complex power Understand effective power, reactive power, apparent power and power factor.
Class 11 Resonant circuits and Q factors Understand resonace phenomena, and draw impedance locus and reactance curve.
Class 12 Mutual inductance and transformers, ideal transformers Understand mutual inductance and properties of transformers.
Class 13 Network theories: duality, reciprocity theorem, Tellegen’s theorem, compensation theorem Understand theorems useful for analyzing circuits.
Class 14 Parameters expressing two-port networks Obtain impedance, admittance, cascade and scattering parameters of 2-port networks.

Out-of-Class Study Time (Preparation and Review)

To enhance effective learning, students are encouraged to spend approximately 100 minutes preparing for class and another 100 minutes reviewing class content afterwards (including assignments) for each class.
They should do so by referring to textbooks and other course material.


None required. Course materials are provided during class.

Reference books, course materials, etc.

All materials used in class can be found on OCW-i.

Assessment criteria and methods

Students will be assesed on their understanding of phasor representation, impedance, and admittance, and their ability to analyze AC networks.
Students’ course scores are based on mid-term exam (50%) and final exam (50%).

Related courses

  • LAS.M102 : Linear Algebra I / Recitation
  • LAS.M101 : Calculus I / Recitation
  • ICT.I207 : Linear Circuits
  • ICT.S206 : Signal and System Analysis

Prerequisites (i.e., required knowledge, skills, courses, etc.)

No prerequisites.

Contact information (e-mail and phone)    Notice : Please replace from "[at]" to "@"(half-width character).

Takagi, Shigetaka: takagi[at]ict.e.titech.ac.jp
Tsuyoshi Isshiki: isshiki[at]ict.e.titech.ac.jp

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