Positive SSL
1 有一變壓器在負載功因為1時,滿載與半載的效率相等,則此變壓器鐵損與滿載銅損之比為
A 12
B 13
C 1/2
D 1/3

Pc:鐵損,Pcu:滿載銅損,Po:滿載輸出

Pc:鐵損,0.25Pcu:半載銅損,0.5Po:半載輸出

滿載: η=PoPo+Pc+Pcu

半載: η=0.5Po0.5Po+Pc+0.25Pcu

PoPo+Pc+Pcu = 0.5Po0.5Po+Pc+0.25Pcu

PoPo+Pc+Pcu = PoPo+2Pc+0.5Pcu

Pc+Pcu=2Pc+0.5Pcu

PcPcu=12