tolloooong di bantu dong, gambarnya udah aku perbaikin

Np/Ns = Vp/Vs
220/640 = 220/Vs
Vs = 220.640 ÷ 220 = 640Volt

Vs = Is.Rs
640V = Is.80ohm
Is = 640V/80ohm = 8Ampere

Np/Ns = Is/Ip
220/640 = 8/Ip
Ip = 8.640 ÷ 220 = 23,27Ampere