# 31618 - Fundamentals of Electrotechnics

• Campus: Bologna
• Corso: First cycle degree programme (L) in Civil Engineering (cod. 8888)
• from Feb 19, 2024 to Apr 16, 2024

## Learning outcomes

Learn the methodologies necessary for the analysis of DC lumped parameter electric circuits. Acquire the basic knowledge required for the analysis of single-phase and three-phase sinusoidal electric circuits and magnetic circuits. Provide the fundamentals of electrical machines and electrical systems in general, with particular reference to applications in the chemical industry.

## Course contents

A prior knowledge and understanding of the following topics is required to attend with profit this course. Fluent spoken and written Italian is a necessary pre-requisite: all lectures and tutorials, and all study material will be in Italian.

The following basic knowledge in mathematics is required: linear algebraic equation systems, complex number operations, and differential and integral calculus. Physics knowledge is also required, with particular reference to electromagnetism. This knowledge can be acquired by passing the basic exams of mathematics and physics at the School of Engineering.

Program

Kirchhoff’s laws. Main circuit components: resistors, inductors, capacitors, independent voltage and current generators. Stationary regimes. Resistances in parallel and in series. Delta-wye transformation. Methods of analysis of electrical circuits. Kirchhoff equations method. Nodal analysis. Mesh analysis. Effect superposition principle. Tellegen, Norton and Thevenin theorems. Study of transients. RC, RL, RLC circuits. Definition of the initial conditions for the analysis of transients. Sinusoidal regimes. Ohm symbolic law and concept of impedance. Kirchhoff symbolic laws. The symbolic method for the analysis of electric circuits in sinusoidal regimes. Power in sinusoidal regime. Three phase systems. Wye and delta components. Power in a three phase system.

The transformer. Working principle. Field hypotheses. Internal and external equations. Equivalent circuits. Transformers working in open circuit and short circuit. Measurement of the efficiency.

G. Chitarin, F. Gnesotto, M. Guarnieri, A. Maschio, A. Stella - "Elettrotecnica 1. Principi", Esculapio Ingegneria, 2017

G. Chitarin, F. Gnesotto, M. Guarnieri, A. Maschio, A. Stella - "Elettrotecnica 2. Applicazioni", Esculapio Ingegneria, 2017

G. Rizzoni, "Elettrotecnica: principi e applicazioni", McGraw-Hill, 3 edizione, 2013.

A. R. Hambley: "Elettrotecnica", Prentice Hall, 4 edizione, 2013

## Teaching methods

The course contents are illustrated during the lectures. Two hours of lecture per week will be dedicated to the solution of exercises. Six laboratory practices are also required, including three experimental exercises and three computer exercises. Experimental exercises will consist in the realization of DC and AC circuits and the measurement of transformer efficiency. Computer exercises will address the solution of DC, AC circuits and transients, using commercial software.

## Assessment methods

The exam consists of a written test involving the solution of electric circuits in DC and alternating current regime. During the test the student cannot use any text. It is permitted to use the calculator.

## Teaching tools

The lecture notes of the course are available on the virtuale.unibo.it platform

## Office hours

See the website of Antonio Morandi