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Ps= Vs x Is
12 = 6 x Is
Is = 12/6
Is = 2 Ampere
efisiensi = (Is x Vs / Ip x Vp) 100%
0,4 = (2 x 6 / Ip x 120)
0,4 = 12 / 120 Ip
0,4 = 1/10 Ip
Ip = 1/4 Ampere
Ip = 0,25 Ampere