Electrical Systems

Code:

EM0021

Acronym:

SE

Keywords
Classification	Keyword
OFICIAL	Physics

Instance: 2008/2009 - 2S

Active?	Yes
Responsible unit:	Automation, Instrumentation and Control Section
Course/CS Responsible:	Master in Mechanical Engineering

Cycles of Study/Courses

Acronym	No. of Students	Study Plan	Curricular Years	Credits UCN	Credits ECTS	Contact hours	Total Time
MIEM	193	Syllabus since 2006/2007	2	-	6	63	160
		Plano de estudos de transição para 2006/07	2	-	6	63	160

Teaching language

Portuguese

Objectives

BACKGROUND
The pervasive presence of electronic devices and instrumentation in all aspects of engineering design and analysis is one of the manifestations of the electronic revolution that characterized the second half of the 20th century. Every aspect of engineering practice, and even of everyday life, has been affected in same way of another by electrical and electronic devices and instruments. Computers are perhaps the most obvious manifestations of this presence. However, many other areas of electrical engineering are also important for the practicing engineer, from mechanical and industrial engineering to chemical, materials engineering and civil engineering.

The integration of electronics and computer technologies in all engineering academic disciplines and the emergence of digital electronics and microcomputers as a central element of many engineering products and processes have become a common theme across the world. In this context, this course acts as an introductory course in electrical circuits, and electromechanics within the Mechanical Engineering curriculum.

SPECIFIC AIMS

The main objective of this course is to present the basic principles and foundations of Electricity and Electrical Machines to the Mechanical Engineering students. That is, to an audience composed of non-electrical engineering students.

A second objective is to present the essential material in an uncomplicated fashion, focusing on the important results and applications, and presenting the students with the most appropriate analytical and computational tools to solve a variety of practical problems.


PREVIOUS KNOWLEDGE

A previous knowledge on differential and integral calculus is required (from Mathematical Analysis I course).

PERCENTUAL DISTRIBUTION

Estimated percentual distribution for the scientific and technological contents:
- Scientific component: 60 %.
- Technological component: 40 %.


LEARNING OUTCOMES

At the end of the course, the students should:
1. be able to use the fundamental techniques for the analysis of DC and AC circuits;
2. know the fundamental laws of electromagnetism, including the ability to analyze elementary magnetic circuits;
3. understand the basic operation principles of rotating electric machines ;
4. have practice with basic laboratory equipment: multimeters, oscilloscopes, power supplies and signal generators.

Program

1. Fundamentals of electric circuits
1.1. Charge, Current and Kirchhoff’s Current Law
1.2. Voltage and Kirchhoff’s Voltage Law
1.3. Ideal Voltage and Current Sources
1.4. Electric Power
1.5. Resistance and Ohm’s Law
1.6. Practical Voltage and Current Sources
1.7. Measuring Devices
2. DC Circuits
2.1. The Node Voltage Method and The Mesh Current Method
2.2. Thévenin and Norton Equivalent Circuits
2.3. Maximum Power Transfer
3. AC Circuits
3.1. Energy-Storage Elements
3.2. Time-Dependent Signal Sources
3.3. Solution of Circuits Containing Energy
3.4. Storage Elements
3.5. Phasors and Electric Impedance
3.6. AC Circuit Analysis Methods
3.7. Frequency Response of AC circuits
3.8. Three-Phase Circuits
4. Power in AC Circuits
4.1. Active, Reactive and Apparent Power
4.2. Power Factor
4.3. Three-Phase Power
4.4. Basic Notions on Residential Wiring
5. Principles of Electromechanics
5.1. Electricity and Magnetism
5.2. Magnetic Circuits
5.3. Magnetic Materials and B–H Curves
5.4. Transformers
5.5. Electromechanical Energy Conversion
6. Introduction to Electric Machines
6.1. Basic Operation
6.2. DC Generators, DC Motors
6.3. AC Machines
6.4. The Induction Motor

Mandatory literature

António Mendes Lopes, Francisco Vasques; Sistemas Eléctricos: guia de trabalhos práticos
Rizzoni, Giorgio; Principles and applications of electrical engineering. ISBN: 0-07-121771-1

Complementary Bibliography

António Mendes Lopes, Francisco Vasques; Sistemas Eléctricos: slides (Disponível no site da disciplina)
William Hayt, Jack Kemmerly, Steven Durbin; Análise de Circuitos em Engenharia 7e, MaGraw-Hill, 2008. ISBN: 978-85-7726-021-8
Alexander, Charles K.; Fundamentos de circuitos eléctricos. ISBN: 978-85-86804-97-7

Teaching methods and learning activities

Two types of classes (tutorials (T.) and laboratorial (L.)) with complementary objectives: exposition of the course subjects and discussion of practical cases (T.) and execution of laboratorial experiments (L.).

keywords

Technological sciences > Engineering > Mechanical engineering > Electromechanical engineering
Physical sciences > Physics > Applied physics > Experimental physics
Physical sciences > Physics > Applied physics > Experimental physics
Technological sciences > Engineering > Mechanical engineering > Electromechanical engineering

Evaluation Type

Distributed evaluation with final exam

Assessment Components

Description	Type	Time (hours)	Weight (%)	End date
Subject Classes	Participação presencial	58,00
	Exame	4,00
Study	Exame	60,00
Examinations study	Exame	40,00
	Total:	-	0,00

Eligibility for exams

Minimum attendance to the practical classes.

Calculation formula of final grade

There are two evaluation components:
1. Component A: Individual performance analysis of each student in the laboratory, complemented by the analysis of a set of requested home-works;
2. Component B: final exam.

For students with a classification in component B greater or equal to 9.0, the final classification will be the average of component A (30%) and component B (70%);

For students with a classification in component B smaller than 9.0, the final classification will be the classification of component B.

Special assessment (TE, DA, ...)

1 oral practical examination replaces component A;
1 two-hour written examination paper replaces component B.

Classification improvement

1 oral practical examination replaces component A;
1 two-hour written examination paper replaces component B.