Subject description - AE1B31EOS

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AE1B31EOS Electrical circuits
Roles:P, V Extent of teaching:3P+2S
Department:13131 Language of teaching:EN
Guarantors:  Completion:Z,ZK
Lecturers:  Credits:6
Tutors:  Semester:L


The subject describes fundamental methods of electrical circuit analysis. The aim is to unify different level of knowledge of students coming from schools of different categories and form the basis of knowledge necessary for next subjects. It presents the difference among physical circuit and its models, and then it presents the behavior of basic ideal circuit elements in DC circuits and in sinusoidal steady state as well as transients, caused by changes in the circuit. Finally, it presents the brief description of more sophisticated methods of analysis (Laplace transform, pulse excitation ?).

Study targets:

The aim is to unify different level of knowledge of students coming from schools of different categories and form the basis of knowledge necessary for next subjects. After finishing this subject each student should understand to fundamental principles of electric circuits, their behavior and fundamental methods of analysis.

Course outlines:

1. Electrical devices and its models. Basic quantities (electrical charge, voltage, current, power), special values. Sign conventions, fundamental topological terms (node, loop). Basic ideal passive and active circuit elements, Ohms? law.
2. Basic laws and theorems (Kirchhoff's circuit laws, Thévenin?s and Norton's theorem, superposition theorem), examples of application (equivalence of circuit elements, voltage divider, current divider, actual sources).
3. Procedures and methods of electrical circuit analysis. Elementary analysis of linear resistive circuits. Circuits excited by one and several independent sources. Application of source equivalency method, load line.
4. Power and power matching in resistive circuits. Working states of electrical circuits (transients, steady state). DC steady state, circuit model in DC steady state. General methods of resistive circuit analysis - nodal analysis.
5. General methods of resistive circuit analysis - circuit equations (circuit topology, loop analysis, nodal analysis). Comparison of distinct methods of analysis in DC, examples.
6. Sinusoidal steady state, representation of a sine wave as a phasor, circuit elements at sinusoidal excitation, impedance and admittance. Phasor diagrams. AC analysis.
7. Power and power matching in AC circuits. Resonant circuits.
8. Three-phase circuits. Powers in multiphase circuits, phasor diagrams.
9. Frequency dependence of network functions (impedance, admittance, transfer function). Frequency response, its graphical representation, asymptotic approximation (Bode?s plot).
10. Circuit equations in time domain, transients in electrical circuits. Transients in the 1st order circuit excited by DC source.
11. Transients in the 2nd order circuit excited by DC source - aperiodic and quasiperiodic case, oscillating RLC circuits. Transients with sinusoidal excitation.
12. Transient analyses using Laplace transform. Excitation by single pulses, unit impulse and unit step response.
13. Relationship among description and behavior of circuits in time and frequency domain. Steady state in linear circuit excited by periodical non-sinusoidal source, Fourier series.

Exercises outline:

1. Introduction. Electrical voltage and current, sources of electrical energy, loads, electrical circuit and its physical analogies.
2. Circuit variables and its basic quantities. Ideal passive and active circuit elements, Ohm's law, electrical circuit. Kirchhoff's laws. Series and parallel connection of resistors (common voltage or common current), voltage divider and current divider. Connection of ideal independent sources.
3. Thévenin's and Norton's theorems, substitution of sources, loaded dividers. Superposition theorem. Elementary analysis of linear resistive circuits.
4. Series and parallel connection of actual electrical sources. Power supplied by the source, power absorbed by the resistor, power matching.
5. Nodal analysis and loop analysis of resistive circuits. Input and output resistance of two-port circuit.
6. Representation of a sine wave by a phasor, circuit elements at sinusoidal excitation, impedance and admittance. Simple circuits in the sinusoidal steady state, integrating and differentiating circuits.
7. Phasor diagrams. Power and power matching in the sinusoidal steady state. Nodal and loop analysis using phasors.
8. Resonance, resonant circuits. Three-phase circuits, power and phasor diagrams in multiphase circuits.
9. Frequency responses of integrating and differentiating circuit, frequency range of valid operation, PWM. Frequency response of more complex circuits.
10. Voltage-current relationship of energy storage elements. Capacitor supplied by constant current, inductor supplied by constant voltage. Transients in the 1st order circuits excited by DC (constant) source and/or by AC (sinusoidal) source.
11. Transients in the 2st order RLC circuits excited by DC (constant) source, aperiodic and quasiperiodic (damped oscillations) case.
12. Transient analyses using Laplace transform, excitation by single pulses, unit impulse response, and unit step response.
13. Reserve, recapitulation, assessment.


1. Mikulec M., Havlíček V.: Basic Circuit Theory, Vydavatelství ČVUT, Praha,2008, ISBN 80-01-02127-0
2. Irwin, J. D., Nelms R. M.: Basic engineering circuit analysis: / 9th ed., Wiley, 2008, ISBN 0470128690
3. Floyd T. L.: Principles of Electric Circuits, Conventional Current Version, 8th ed., Pearsen Prentice Hall, ISBN 0-13-170179-7
4. Alexander Ch. K., Sadiku M., N. O.: Fundamentals of Electric Circuits, 3rd ed., Mc Graw Hill, ISBN: 978-0-07-297718-9


Assume from math student will know complex numbers, elementary integrals and derivatives, and Laplace transform fundamentals. He / she should know solving procedure of differential equation of the 1st and 2nd order. Student should be able solve system of equations. Basic knowledge of mathematical and simulation programs (Matlab, Maple) is welcomed.


analog circuit analysis, KVL, KCL, nodal analysis, mesh analysis, circuit theorem, first-order circuit, second-order circuit, sinusoidal steady-state analysis, AC power analysis, frequency response, three-phase circuit, unit impulse response, unit step response, Fourier series

Subject is included into these academic programs:

Program Branch Role Recommended semester
BEKME1 Communication Technology V 2
BEKME5 Komunikace a elektronika V 2
BEKME_BO Common courses V 2
BEKME4 Network and Information Technology V 2
BEKME3 Applied Electronics V 2
BEKME2 Multimedia Technology V 2
BEEEM1 Applied Electrical Engineering P 2
BEEEM_BO Common courses P 2
BEEEM2 Electrical Engineering and Management P 2
BEKYR1 Robotics V 2
BEKYR_BO Common courses V 2
BEKYR3 Systems and Control V 2
BEKYR2 Sensors and Instrumentation V 2
BEOI1 Computer Systems V 2
BEOI_BO Common courses V 2
BEOI3 Software Systems V 2
BEOI2 Computer and Information Science V 2

Page updated 30.7.2021 19:52:17, semester: L/2021-2, L/2020-1, Z,L/2022-3, Z/2021-2, Send comments about the content to the Administrators of the Academic Programs Proposal and Realization: I. Halaška (K336), J. Novák (K336)