- Docente: Pier Luigi Ribani
- Credits: 3
- SSD: ING-IND/31
- Language: Italian
- Teaching Mode: Traditional lectures
- Campus: Bologna
- Corso: First cycle degree programme (L) in Civil Engineering (cod. 8888)
Learning outcomes
The student is able to solve electric circuit of the monophase or threephase type in direct or alternate current regime. The student also knows the operating principle of the main electrical machines, in particular the transformer.
Course contents
Prerequisites: the student should know the main concepts of analysis and physics as presented in the courses of the first year of the School of Engineering. In particular: solution of ordinary differential equations, operations with complex numbers, partial differential equations, electromagnetic field equations in the vacuum space
Program:
Electric circuits. From field theory to circuit theory. Lumped parameter electric circuit. Kirchhoff's laws. Main circuit devices: resistor, inductor, capacitor, ideal voltage and current source, diode. Main network analysis methods: fundamental loops, node voltages, series and parallel connection of resistors. Main theorems for linear network analysis: superposition principle, Thevenin, Norton. Introduction to network analysis in transient regime. Alternate current regime. AC network analysis with the phasor method. Electrical power in AC regime. Reactive power compensation. Three-phase systems. Star and delta connected loads. Power in three-phase systems. Three-phase systems with neutral wire.
Transformer. Main characteristics and operating principle. Equivalent electrical network. No load and short circuit operating regime. Efficiency measurements. Three phase transformers. Parallel connection of transformers.
Readings/Bibliography
The student can find a treatise of the topics analyzed during the course in the following books and can utilize a trace of the lessons which is online on the website of the teacher (http://www.die.ing.unibo.it/pers/ribani/ribani.htm)
G. Rizzoni, Elettrotecnica: principi e applicazioni, McGraw-Hill, 3 edizione, 2013.
A. R. Hambley: Elettrotecnica, Prentice Hall, 4 edizione, 2013
G. Fabricatore, Elettrotecnica ed applicazioni, Ed. Liguori, 1994.
Teaching methods
The course is carried out with classroom lessons during which all the topics of the program are developed. In particular the electric circuit topics are treated writing on the blackboard giving a lot of space to exercises on the numerical solution of linear electric circuits in dc and ac regime, of monophase and threephase type. The topics regarding the transformer are developed mainly with a computer presentation which is online at the website of the teacher.
Assessment methods
The examination is made of a written test which consists in the solution of a linear electric circuit, of the monophase or threephase type, in alternate current regime. During the test, the student can not check any written document but needs to use a scientific calculator. The grade of the test will be in thirtieth; the grade of the test is obtained subtracting to the maximum grade (30 for a correct solution, either for the procedure and the numerical values) 5 points for any conceptual mistake and 1 point for any calculation mistake. The test is passed when the grade is larger than or equal to 18/30.
Office hours
See the website of Pier Luigi Ribani