Energy can neither be created nor be destroyed, if energy disappear in one form it will reappear in another form without any loss.
so what will happen if FAN switched on in the space. ?
1.Electrical energy make Copper coil to burn. (Heat Energy)
2.Electrical energy converted into flame by burning of coil(Light Energy..?how it burn when no oxygen in the space)
3.Electrical energy converted into electromagnetic energy since by Boyle's law pressure directly proportional to Temperature. if pressure is Zero since its vacuum obviously it made temperature also zero. so there is no chance for heat or light energy.
4.Electrical energy converted into Mechanical energy. without any loss .
5.else any new from of energy gets transformed other than i mentioned.
Thanks and regards.