A magnetron is a vacuum tube which works by swirling space charge around. Vacuum tubes are "electronics"; the word "electronics" was originally invented to distinguish vacuum tubes (where it matters that the charges are being carried by electrons) from previous electrical devices such as relays, resistors, condensers, motors, generators, and inductors, where you can pretty much ignore the nature of the charge carriers.
It was a class on embedded electronics and robotics. There are more hazards in electronics than merely electrical hazards. e.g. exploding capacitors, toxic fumes, etc.
