Electricity

Code:

L.EM020

Acronym:

E

Keywords
Classification	Keyword
OFICIAL	Automation

Instance: 2023/2024 - 2S

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

Cycles of Study/Courses

Acronym	No. of Students	Study Plan	Curricular Years	Credits UCN	Credits ECTS	Contact hours	Total Time
L.EM	231	Syllabus	2	-	6	58,5	162

Teaching language

Portuguese

Objectives

SPECIFIC AIMS The main objective of this course is to present the basic principles and foundations of Electricity and Magnetic Circuits 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.

Learning outcomes and competences

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. have practice with basic laboratory equipment: multimeters, oscilloscopes, power supplies and signal generators.

Working method

Presencial

Pre-requirements (prior knowledge) and co-requirements (common knowledge)

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

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

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

Complementary Bibliography

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

Teaching methods and learning activities

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

keywords

Technological sciences > Engineering > Mechanical engineering > Electromechanical engineering
Physical sciences > Physics > Electromagnetism

Evaluation Type

Distributed evaluation without final exam

Assessment Components

Designation	Weight (%)
Exame	75,00
Participação presencial	0,00
Trabalho laboratorial	25,00
Total:	100,00

Amount of time allocated to each course unit

Designation	Time (hours)
Estudo autónomo	100,00
Frequência das aulas	42,00
Trabalho laboratorial	20,00
Total:	162,00

Eligibility for exams

Minimum attendance to the practical classes.

Calculation formula of final grade

There are two evaluation components: 1. Component DL: Individual performance analysis of each student in the laboratory (25%); 2. Component MT: two intermediate examinations (75%). For students with a classification in component MT greater or equal to 8.0, the final classification will be the average of component DL (25%) and component MT (75%); For students with a classification in component MT smaller than 8.0, the final classification will be the classification of component MT.

Special assessment (TE, DA, ...)

1 oral practical examination replaces component DL; 1 two-hour written examination paper replaces component MT.

Classification improvement

1 oral practical examination replaces component DL; 1 two-hour written examination paper replaces component MT.