Eletrotecnia II

Circuit Theory 1, Mathematics and Physics

In theoretical and theoretical-practical classes, a theoretical exposition is made, in active interaction with students, of each subject, which is immediately complemented by the resolution (individual or group) of examples of application of knowledge for consolidation.

At the end of the UC, students must be able to:

• Distinguish between single-phase and polyphase systems;
• Analyze (explain and solve) three-phase (balanced) sinusoidal alternating current electrical circuits (with star and/or delta connections);
• Analyze (explain and solve) three-phase (unbalanced) electrical circuits of sinusoidal alternating current (with star and/or delta connections);
• Determine the characteristic damping factor and resonant frequency of RLC circuits in series or parallel;
• Calculate the quality factor of a network and the bandwidth of a network;
• Use frequency and amplitude scaling techniques;
• Calculate the complete response (natural and forced) of RLC circuits
• Explain the phenomenon of resonance and relate it to possible practical applications
• Dimension (calculate) the elements necessary to correct the power factor

1. Power factor correction.

2. Series and Parallel Resonance: Frequency response; Parallel resonance; Series resonance; Other resonant forms; Dimensioning of resonance phenomena.

3. Three-Phase Alternating Current: Three-phase systems; Simple and compound tensions; Star or triangle connection; Active, reactive and apparent powers in three-phase systems; Balanced and unbalanced systems; Balanced systems analysis methods; Methods for analyzing unbalanced systems.

4. Transient phenomena in linear electrical circuits: Transient phenomena in direct current circuits; Calculation of current, voltage and load expressions in RL, RC and RLC circuits; Transient phenomena in alternating current circuits.

Assessment may be done through periodic evaluation or a final exam.

1. Periodic Evaluation:

Three mini-tests will be conducted (during classes and on dates to be agreed upon with the students), each worth 20 points. To pass the course, the student must simultaneously:

Average test scores greater than or equal to 9.5 points;

Attendance at least 75% of the total classes (T+TP) up to the date of each evaluation exam (this requirement does not apply to working students).

Students who fail the distributed evaluation may take the regular or resit exam.

The dates of the evaluations will be defined in the first week of classes according to the students' interest and the course management.

2. Final Exam Evaluation:

Evaluation by exam (worth 20 points) during the regular and/or resit periods, covering all the material.

NAO