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Verified answer
Diket :Np = 2500
Ns = 4000
Ip = 1,2 A
Is = 0,5 A
dit : efisiensi trafo
jwb :
ef = ( Is . Ns / Ip . Np ) . 100%
ef = ( 0,5 . 4000 / 1,2 . 2500 ) .100%
ef = ( 2000 / 3000 ) . 100%
ef = 66,66%