06793 - Electrotechnics

Course contents

Electrotechnics

• Electromagnetic theory: Fundamental definitions. Maxwell's equations. Constitutive equations.  Poynting's theorem.
• Electrostatics: Electrostatic potential. Poisson's and Laplace's equations. Capacitors.
• Steady current field and DC circuits: Kirchhoff's laws. Circuit elements: resistors, independent voltage and current sources, dependent sources. Power and energy. Passive and active elements. Sign conventions. Series and parallel circuits. Current and voltage dividers. Source transformations. Delta-wye transformations. Network topology. Graph of a circuit, tree and co-tree, sets of fundamental cuts and loops. Nodal and mesh analysis. Superposition principle. Tellegen's theorem. Millman's theorem. Thevenin's and Norton's theorems.
• Magnetostatics: Steady state magnetic field. Magnetic vector potential. Magnetic reluctance and permeance. Hopkinson's law. Magnetic circuits. Self and mutual induction.
• Quasi-static electrodynamics: Relationships between field theory an circuit theory. Dynamic components and circuits.
• AC circuits: Phasors. Impedance and admittance. Circuit analysis in the phasor domain. Power in AC circuits: active, reactive, apparent. Complex power. Power factor correction. Maximum power transfer. Resonance. Three-phase systems.
• Transient analysis: First order RC and RL circuits. Initial conditions. Transient and steady state response. Zero input and zero state response. Second order RLC circuits.
• Transformers: principle of operation, equations, equivalent circuit, short and open circuit tests, efficiency.

Electronics

• Linear circuits: N-port networks; two-port networks; admittance, impedance, and hybrid parameters; symmetric and reciprocal networks; equivalent circuits of a two port network; network functions; filters; bode diagrams.
• Operational amplifiers: ideal model of the operational amplifier; positive and negative feedback.; operational amplifier circuits: inverting and non-inverting amplifier, voltage follower, adder, voltage/current converter; integrator, differentiator; differential amplifiers; CMRR; non-ideal operational amplifiers: input impedance, saturation, gain-bandwidth product, slew rate; inverting and non-inverting amplifiers using finite-gain op-amps.
• The diode: ideal model, PN-junction physiscs, Shockley equation; diode models; diode circuits; resolution of non-linear circuits based on separate working regions.
• Overview of the BJT transistor: working regions, models; common-base, common collector and common emitter configurations.
• Spice circuit simulation : DC, AC and transient analysis; design and simulation of simple circuits based on operational amplifiers and diodes.

Readings/Bibliography

ecture slides are available at the following address:
http://www.die.ing.unibo.it/pers/mastri/didattica.htm

Exercises:

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

References:

• R. Perfetti. Circuiti elettrici. Zanichelli.
• C.K. Alexander, M.N.O. Sadiku. Circuiti elettrici. McGraw-Hill.
• G. Rizzoni. Elettrotecnica: Principi ed applicazioni. McGraw-Hill.
• G. Fabricatore, Elettrotecnica ed applicazioni, Ed. Liguori.

Teaching methods

Theoretical lessons and numerical exercises.

Assessment methods

The exam consists of a written test and includes a set of exercises, aiming to verify that the students understand and know how to apply the methods of circuit analysis, and a questionnaire on the theoretical aspects of the course.
During the examination is not allowed to consult books or notes, while the use of a calculator is recommended.
More information about the exam will be provided during the course and, in particular, examples resolution of exam exercises be presented during the exercitations. Exam exercises proposed in previous years and their solutions are available at the address http://www.die.ing.unibo.it/pers/mastri/didattica.htm

Links to further information

http://www.die.ing.unibo.it/pers/mastri/didattica.htm

Office hours

See the website of Franco Mastri