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Verified answer
Diketahui :N primer = 90
N sekunder = 120
V sekunder = 20 V
V primer = ......?
persamaan matematis Trafo adalah :
Vp / Vs = Np/Ns
Vp / 20 = 90 / 120
120 Vp = 20 . 90
Vp = 1800 / 120
Vp = 15 Volt