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19.) diketahui
input = tegangan primer
output = tegangan sekunder

Vp = 200v
Vs = 40v
Np = 1100 lilitan
Ns = x

jawab:

Vp /Vs = Np/ Ns
200/40 = 1100 /x
200.x = 1100.40
200. x = 44000
x = 44000/200
x (Ns) = 220 lilitan

jawaban B

27.) diketahui (atas)
N1 = 50 lilitan
N2 = x
V1 = 12v
V2 = 24v

(bawah)
N1 = 100 lilitan
N2 = 200 lilitan
V1 = Y
V2 = 40v

mencari yang x
rumus Vp/ Vs = Np/Ns
12/24 = 50/x
12.x = 50.24
12.x = 1.200
x = 1.200 / 12
x = 100 lilitan

skrg mencari yang Y
Vp/Vs = Np/Ns
y / 40 = 100/ 200
200. y = 100.40
200.y = 4000
y = 4000/200
y = 20v

jawaban C

28.) diketahui

V1 = 220 v
V2 = 110v
N1 = 200 lilitan

rumus: Vp/Vs = Np/Ns
220 /110 = 200 / x
220.x = 200.110
220. x = 22000
x =22000 / 220
x = 100

jadi N2 nya adalah 100 lilitan

maaf hanya segitu setau saya
semoga membantu
beri tanda terbaik jika berkenan^_^