sebiah transformator lilitan primer 500 lilitan dan lilitan sekunder 1500 lilitan serta tegangan sekunder 220 volt tentukan. besar tegangan primer,besar arus se

Vp / Vs = Np / Ns
Vp = Vs Np / Ns
     = (220 V)(500 lilitan) / (1500 lilitan) = 220/3 V ≈ 73,33 V

Is / Ip = Np / Ns
Is = Ip Np / Ns
    = (2 A)(500 lilitan) / (1500 lilitan) = 2/3 A ≈ 0,67 A

η = Vs Is / (Vp Ip)
   = (220 V)(2/3 A) / [(220/3 A)(2 A)] = 1 = 100%

Transformator step up.