Publication in the Diário da República: Aviso n.º 3961/2023 - 29/03/2023
5 ECTS; 1º Ano, 1º Semestre, 60,0 TP , Cód. 626329.
Lecturer
- Raul Manuel Domingos Monteiro (1)
(1) Docente Responsável
(2) Docente que lecciona
Prerequisites
Not applicable.
Objectives
To enable students to analyze direct current and sinusoidal alternating current circuits, both single-phase and three-phase, and to introduce basic concepts of electromagnetism and a simplified study of the single-phase electrical transformer.
Program
1. Fundamental quantities and components of electrical circuits; definitions. 1.1 Electric Charge. Electric Field. Electric Current. Electric Voltage. Forms of electric current: unidirectional current and variable direction current; alternating current. 1.2 International system of units; prefixes. 1.3 Electrical resistance of a metallic conductor; resistivity; conductance; conductivity; variation with temperature. 2. Direct current circuits. 2.1 Ohm's Law. Resistance as a circuit element. Characteristics of resistances; color code. 2.2 Independent voltage and current sources. Real circuit elements using ideal sources.
2.3 Joule's Law. Power absorbed and supplied by a circuit element. 2.4 Kirchhoff's Laws. Analysis of simple circuits. Association of resistances and conductances. Voltage and current divider. Superposition theorem. Thévenin's theorem. Norton's theorem. Maximum power transfer theorem. 2.5 Systematic Methods for Electrical Circuit Analysis. 3. Single-phase sinusoidal alternating current. 3.1 Necessity of alternating current. 3.2 Characteristic quantities. Mathematical representation. Phase angle between sinusoidal quantities of the same frequency; particular values. Vector representation. 3.3 Characterization of circuit elements in sinusoidal alternating current regime: resistance, coil, and capacitor. Reactance, impedance, admittance. 3.4 Alternating current circuits. Resonance. 3.5 Active, reactive, and apparent power. Power factor. 4. Three-phase sinusoidal alternating current. 4.1 Three-phase voltage system. Mathematical and vector representation. Star and delta connection. 4.2 Balanced and unbalanced systems. 4.3 Power in three-phase systems. Boucherot's method. Power factor compensation in three-phase systems. 5. Introduction to magnetism and electromagnetism. 5.1 Electric current and magnetic field. 5.2 Magnetic circuits. Self-induction and mutual induction. 5.3 Operating principle of electrical transformers. Conclusions.
Evaluation Methodology
Continuous Assessment - Two Frequency Grades Final grade in case of continuous assessment (CFC) CFC=F where F is the arithmetic mean of the two frequencies Exempt from exam if: CFC>=9.5 points (out of 20) Final Assessment - Exam (E) (minimum grade of 9.5 points out of 20) Final grade in case of assessment by exam (CFE) CFE=E Passed if: CFE>=9.5 points (out of 20)
Bibliography
- Edminister, J. e Nahvi, . (2014). Circuitos Eléctricos Coleção Schaum (livro de exercícios). (Vol. 1). Bookman: Bookman
- Meireles, V. (2009). Circuitos Eléctricos. Lidel : Lidel
- Monteiro, R. e Nunes, F. (2023). Sebenta de Eletricidade: corrente contínua e corrente alternada. IPT: IPT
- Sadiku, M. e Alexander , C. (2013). Fundamentos de Circuitos Elétricos . McGraw Hill : McGraw Hill
Teaching Method
Theoretical and practical classes for oral presentation of the theoretical material and for solving exercises.
Software used in class
Not applicable.
