This is the first of three reference videos preceding a complete series on the Beech 1900D.
You might be wondering about the purpose of a video on the electrical system. The purpose of the reference videos is to cover in some depth various aspects of the aircraft. The presentation of this material is difficult within the context of a tutorial.
The electrical system is the backbone of the aircraft. And rather than simply explain that the battery switch must be in the on position, having a greater understanding of the electrical system as a whole puts the switch into context. A better understanding of the aircraft is therefore created.