As a Chalmers-employed PhD student, teaching is part of your work duties. In most cases, teaching will fill most/all of your department work duties (20% of working hours - equivalent to 340 hours a year) - at least from an accounting perspective. The different teaching activities you may carry out as a PhD student include:
To keep track of your various teaching activities, it is highly recommended to create and regularly update a Teaching portfolio. Especially if you plan on doing a Career in academia, this document will be of immense value as you will have to demonstrate what teaching experience you bring with you.