Chances are, your favorite class is also your strongest area of knowledge. Tell the hiring manager about your favorite class but also include why it was your favorite. If you received special accolades, finished top of the class, or completed an exciting project, be sure to include those points in your answer.
"My favorite post-secondary class was in electrical code because I feel that it was one of my best subjects. It's a complex topic and directly related to safety. I found it challenging, and that excited me."
Entry Level answer example
"My favorite class, by far, was on magnetic control and switching circuits. I loved to learn about reversing magnetic starters and the construction of overload devices."
Experienced answer example
"My biggest strength has always been in electrical theory. I was top of the class on topics such as RLC circuits and three phase basic calculations. I hope to teach these courses someday."