AC-circuitsLaajuus (5 cr)

Objectives

The student can:

• Understand the key concepts of electrical circuits and their origins
• Use current-voltage equations of circuit components in the analysis of electrical circuits and understand the operating principles of basic components
• Systematically analyze electrical circuits
• Understand the concepts and calculations of AC power
• Model circuits with inductively coupled coils

In addition to analytical skills, the student has a strong understanding that any electrical circuit can be systematically solved using Kirchhoff's voltage law, Kirchhoff's current law, and the current-voltage equations of components, and that the main goal of different circuit-solving methods is merely to reduce the workload required for analysis.

Content

AC Circuits: Utilization of complex numbers in the description of AC quantities (phasor calculation), the concept of impedance, review of calculation methods using phasor calculation. AC Power: Active power, reactive power, apparent power, complex power. Mutual Inductance Circuit Modeling: How inductively coupled coils are considered in circuit analysis, the circuit model of an ideal transformer.

Assessment criteria, satisfactory (1-2)

The student is able to analyze simple AC circuits.

Assessment criteria, good (3-4)

The student understands the functional differences between DC and AC circuits. In addition, the student has such a strong routine for analyzing electrical circuits that the complexity of the task does not substantially complicate the task, but only increases the workload. The student has also developed a strong circuit reading skill, which is needed, for example, to simplify complex circuits. The calculation of AC power is smooth.

Assessment criteria, excellent (5)

The student knows the background of circuit analysis so well that he understands that different solution methods are just the application of the same rules in different ways. As a result, the student is able to solve any circuit by any method and is aware that the difference between the methods is ultimately only in the workload. As a result of a strong understanding, the analysis of AC circuits is not substantially more difficult than DC power circuits. The student can model electrical circuits containing mutual inductances and understands how changes in currents and winding directions affect the operation of the electrical circuit.