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1 某100kVA,2200/220V,50Hz之變壓器,在無載時,一次繞組自2200V電源取用440W及0.5A,則無載時功率因數與鐵損電流各為多少?
A 0.4,0.2A
B 0.04,0.02A
C 0.8,0.3A
D 0.08,0.03A

cosθ = PVI

4402200×0.5 = 0.4

Ic=0.5×0.4=0.2A