# PRINCIPLES AND APPLICATIONS OF ELECTRICAL ENGINEERING cod. 1004638

2° year of course - First semester
Professor
Elettrotecnica (ING-IND/31)
Field
Attività formative affini o integrative
Type of training activity
Related/supplementary
63 hours
of face-to-face activities
9 credits
hub:
course unit
in - - -

## Learning objectives

The aim of the course is to show the main techniques for linear circuit analysis

## Prerequisites

Students must be familiar with the concepts and methods treated in the courses of the first year of the degree.

## Course unit content

Current and voltage
Direct current circuits analysis: resistances, voltage and current independent sources, power, efficency. Mesh analysis, node analysis. Thevenin's theorem, Norton's theorem.
Stationary magnet field: magnetic circuits. Inductance coefficient.
Quasi-stationary electromagnetic field:assumptions' validity.
δB/δt and δD/δt effects.
Stray inductance and capacitance.
Electric circuits transient analysis in time domain.
Sinusoidal alternating waveforms. Phasors, active and reactive power.
Resonant circuits. Filters. Bode plot.
Introduction to polyphase systems.
Mesh analysis and node analysis of electric circuit with voltage and current dependent source.
Thevenin's theorem and Norton's theorem.
Two-port systems: impedance, admittance and hybrid parameters, voltage and current gains. Different connections.
Electric circuits transient analysis in Laplace domain and state variables' domain.
Magnetic coupled circuits: equations, reflected impedance.

## Full programme

Voltage and currents. Resistances. Voltage and current independent generators. Current controlled generators and voltage controlled generators. Power and efficiency.

b) Direct current circuits analysis
Kirchhoff principles. Mesh analysis, node analysis. Superposition principle. Thevenin's theorem, Norton's theorem.

c) Steady state electric and magnetic fields
Electric capacity. Dielectrics and electrical insulation. Magnetic circuits and permanent magnets.

d)Quasi stationary electromagnetic field
Validity assumptions. δB/δt and δD/δt effects.
Stray inductance and stray capacitance. Capacitor and inductor and their energetic behavior. Self and mutual inductances. Two ports electric network theory. Impedance, admittance and hybrid parameters matrices, voltage and current gains. Two ports connections.

e) Electric circuits with sinusoidal supply
Phasors, active and reactive power. Resonant circuits. Filters.  Introduction to polyphase systems. Three phase systems. Wye and delta connections.

f) Frequency domain electric circuits analysis
Fourier and Laplace transforms. Transfer functions. Series and parallel resonance. Filters. Bode diagrams.

g) Electric circuits in dynamic conditions
Analysys of electric circuits in time domain and Laplace transform domain. State variables introduction.

## Bibliography

Appunti del docente.
C. K. Alexander, M. N. O. Sadiku, ”Circuiti elettrici”, McGraw-Hill.
I.D. Mayergoyz, W. Lawson, “Elementi di teoria dei circuiti”, UTET.
R.C. Dorf, J.A. Svoboda, “Circuiti elettrici”, Apogeo, Milano.

## Teaching methods

Lectures and numerical exercices

## Assessment methods and criteria

Written and oral examination

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