AC Circuit Theory


Content, progress and pedagogy of the module

The module is based on knowledge achieved in the module Introduction to electrical engineering or similar.

Learning objectives


  • Have an understanding of:
    • Basic steady-state analysis of AC circuits
    • Basic steady-state power analysis of AC circuits
    • The concepts of mutual inductance, coupling coefficients, the ideal transformer and turns ratio
    • Characteristics for balanced three phase circuits
    • Basic three-phase star and delta-connections
    • Variable frequency behaviour for basic R, L and C circuits
    • Characteristics of basic filters: Low pass, high pass, band pass and band stop
    • Various types of circuit functions
    • Definition of poles and zeros
    • Laplace domain representation of basic circuit elements (including initial conditions): R, L and C
    • Characteristics of diodes and passive single-phase and three-phase rectifiers
    • Fourier techniques for circuit analysis


  • Be able to perform calculations of currents and voltages in steady-state AC circuits
  • Be able to perform steady-state power analysis of AC circuits
  • Be able to perform calculations on magnetically coupled circuits
  • Be able to calculate voltages, currents, powers and power factors in three-phase circuits
  • Be able to perform Bode plot and frequency analysis for variable-frequency circuits
  • Be able to perform circuit analysis using Laplace transformation
  • Be able to design single phase and three phase diode rectifiers
  • Be able to perform Fourier analysis of periodic signals in electrical circuits


  • Be able to handle simple development-oriented situations in connection with technical issues of AC circuits in study or work relations
  • Be able to perform laboratory work, digital data collection and analyses of the results of AC circuits in study and work relations

Type of instruction

Lectures with exercises, possibly supplemented with e-learning activities.

Extent and expected workload

Since it is a 5 ECTS course, the work load is expected to be 150 hours for the student.



Name of examAC Circuit Theory
Type of exam
Written or oral exam
Assessment7-point grading scale
Type of gradingInternal examination
Criteria of assessmentThe criteria of assessment are stated in the Examination Policies and Procedures

Facts about the module

Danish titleAC-kredsløbsteori
Module codeN-EN-B3-2B
Module typeCourse
Duration1 semester
Language of instructionDanish
Empty-place SchemeYes
Location of the lectureCampus Aalborg, Campus Esbjerg
Responsible for the module


Study BoardStudy Board of Energy
DepartmentDepartment of Energy
FacultyThe Faculty of Engineering and Science