Electrical Systems

Code:

EM0021

Acronym:

SE

Keywords
Classification	Keyword
OFICIAL	Physics

Instance: 2006/2007 - 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
LEM	1	Plano de estudos de transição para 2006/07	2	6	6	63	160
MIEM	223	Syllabus since 2006/2007	2	-	6	63	160
		Plano de estudos de transição para 2006/07	2	-	6	63	160

Teaching language

Portuguese

Objectives

The aim of this discipline is to present the basic principles and foundations of Electricity and Electrical Machines to the Mechanical Engineering students.

LEARNING OUTCOMES:
At the end of the semester, 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. know the basic operation 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

Rizzoni, Giorgio; Principles and applications of electrical engineering. ISBN: 0-07-121771-1
António Mendes Lopes, Francisco Vasques; Sistemas Eléctricos: guia de trabalhos práticos, 2006

Complementary Bibliography

Paul, C. R.; Introduction to electrical engineering. ISBN: 0-07-112907-3
Meireles, Vítor; Circuitos eléctricos. ISBN: 972-757-386-X
Villate, Jaime E.; Electromagnetismo. ISBN: 972-773-010-8
António Mendes Lopes, Francisco Vasques; Sistemas Eléctricos: slides, 2006

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

Evaluation Type

Distributed evaluation without final exam

Assessment Components

Description	Type	Time (hours)	Weight (%)	End date
Subject Classes	Participação presencial	63,00
	Teste	14,00
	Teste	3,00
	Total:	-	0,00

Amount of time allocated to each course unit

Description	Type	Time (hours)	End date
	Estudo autónomo	82
	Total:	82,00

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: three 45min written mini-tests.

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.