28633 - Electrotechnics T-A

Learning outcomes

At the end of the course students are able to analyse resistive electric circuits, sinusoidal-steady state circuits, first- and second- order circuits, three-phase circuits.

Course contents

Fundamental concepts

Physical circuit and electrical circuit. Circuit models. Electric charge. Electric current. Electrostatic field. Electric potential. Electric field. Voltage.
Lumped parameter electric circuits. Transition from field theory to circuit theory. Kirchhoff's laws. Two-terminal components. User and generator reference. Power and energy. Active and passive components. Elements of network topology.

Steady-state resistive circuits

Resistor and Ohm's law. Short circuit and open circuit. Components in series and parallel. Voltage and current dividers. Wye-delta transformations. Controlled generators, transformation of generators. Multi-pole and multi-port components.

Network theorems: linearity, Tellegen theorem, superposition principle, substitution theorem, Thévenin and Norton theorems, reciprocity theorem, Millman theorem. Independent voltage and current generators. 

Ideal operational amplifier.

Resistive two-port networks: R and G parameters, hybrid parameters, transmission parameters, relationship between parameters, ideal transformer.

General analysis methods: tableau analysis, node potential and mesh current methods.

First and second order circuits

Capacitors and inductors. Properties and combinations in series and parallel. First order RC and RL circuits. Initial conditions. Transient and steady-state components of the response. Zero input response and zero state response. Integrator and differentiator. Second order RLC circuits.

Circuits in sinusoidal steady-state

Sinusoidal functions. Steinmetz transform (symbolic method). Impedance and admittance. Circuit analysis with the symbolic method.

Power in sinusoidal steady-state: instantaneous, active, reactive power. Complex power. Root-mean-square values. Power factor correction. Maximum active power transfer.

Frequency response. Transfer functions. Resonance.

Three-phase systems

Wye and delta users. Balanced and unbalanced users. Power in three-phase systems. Power factor correction of a three-phase load. Three-phase system with neutral.

Readings/Bibliography

For further study, students can consider the following books:

R. Perfetti, "Circuiti elettrici", Zanichelli

C. Alexander, M. Sadiku, "Circuiti Elettrici", McGraw-Hill

G. Chitarin, F. Gnesotto, M. Guarnieri, A. Maschio, A. Stella, "Elettrotecnica 1 - Principi", Società Editrice Esculapio

G. Chitarin, F. Gnesotto, M. Guarnieri, A. Maschio, A. Stella, "Elettrotecnica 2 - Applicazioni", Società Editrice Esculapio

M. Repetto, S. Leva, "Elettrotecnica - Elementi di teoria ed esercizi", Città Studi Edizioni

P. Ghigi, M. Martelli, F. Mastri, Esercizi di Elettrotecnica, Società Editrice Esculapio

S. Barmada, Esercizi di Elettrotecnica, Pisa University Press

M. Panella, A. Rizzi, Esercizi di Elettrotecnica, Società Editrice Esculapio

Teaching methods

The course takes place in the first period of the second year of the first cycle degree course in "Ingegneria Elettronica e Telecomunicazioni", and consists of 6 credits corresponding to 60 hours of lectures, during which the topics covered in the program will be explained in classroom. About 40 hours will be devoted to the theoretical development of the fundamental concepts and methodologies of electrical engineering. The remaining 20 hours will be devoted to exercises, during which the student, using the theoretical notions developed, will acquire the practical skills necessary to analyse electrical circuits in steady-state, transient and sinusoidal regime, as well as three-phase systems.

Assessment methods

Students can register to one of the exams published in the AlmaEsami [https://almaesami.unibo.it/almaesami/welcome.htm] system. The examination consists of a written and an oral exam. The written test consists of three exercises, aimed at verifying that the student is able to correctly apply the analysis methods developed during the course and that he has acquired a critical sensitivity to the obtained results. Students have 120 minutes to solve the exercises, which will focus on the study of electrical circuits in steady state, transient and sinusoidal regimes, and of three-phase systems. Students are allowed to use a hand calculator, as well as printed textbooks and lecture notes. The use of cellular phones, smartphones, tablets, laptops is not allowed.

A minimum score of 15/30 is required to access the oral exam. The score remains valid during the entire session in which the written test has been taken. Partecipating and delivering a written test will cancel the score obtained in any previous test.

Students must take the oral test in the same session in which they passed the written test. During the oral examination, students are invited to discuss some of the topics taught during the course. The discussion is aimed at assessing whether the students have achieved an organic view of the proposed topic, a good grasp of the specific technical language and adequate capacity for synthesis and analysis.

The degree of satisfaction of the above mentioned requirements contribute to the formulation of the final score, together with the mark obtained in the written test.

Teaching tools

Further educational material can be found in Virtuale [https://virtuale.unibo.it/]

Office hours

See the website of Leonardo Sandrolini