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R1 = 2 ohm
R2 = 3 ohm
R3 = 4 ohm
V = 12 Volt
Ditanyakan : R pengganti dan I ?
Dijawab :
R1 dan R2 seri
Rgab = R1 + R2 = 2 + 3 = 5
Rpengganti : R gab paralel dngn R3
jadi :
1/Rp = 1/Rgab + 1/R3
1/Rp = 1/5 + 1/4
1/Rp = 4/20 + 5/20
1/Rp = 9/20
Rp = 20/9
Rp = 2,22 ohm
b. Arus :
I = V/Rp
= 12/2,22
= 5,4 A