bantuin ya:)))......

Diket :
Np = 80
Ns = 100
Vs = 75 v
Ip : Is = 5 : 3

Dit : Efisiensi trafo......,?

Jwb :

# Tegangan primer

Vp = ( Np . Vs ) / Ns
Vp = ( 80 . 75 ) / 100
Vp = 6000 /100
Vp = 60 volt

# Efisiensi trafo

ef = ( Vs . Is / Vp . Ip ) . 100%
ef = ( 75 . 3 / 60 . 5 ) . 100%
ef =( 225 / 300 ) . 100%
ef = 0,75 . 100%
ef = 75 %

Jadi efisiensi trafo tsb 75%