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Verified answer
Diket :Vp = 220 v
Ip = 5 A
Is = 15 A
ef = 90%
dit : Tegangan sekunder
jwb :
Vs = ( ef . Vp . Ip / Is ) . 100%
Vs =( 90% . 220 . 5 / 15 ) . 100%
Vs = ( 990 /15 ) . 100%
Vs = 66 volt
Jadi tegangan sekundernya 66 volt , Trafo step down