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r1=100 ohm
r2=3 ohm
r3=20 ohm
v=2 volt
rangkaian listrik pararel
1/rp=1/2 + 1/r3
1/rp= 1/3 + 1/20
1/rp= 20/60 + 3/60
1/rp= 23/60
rp/1=60/23
rp=2,6087 ohm -------------> jawabannya kita ibaratkan r4
rangkaian linstrik seri
rp=r1 + r4
=100 + 2,6087
=102,6087 ohm
untuk mencari arus listrik (A)
rumus
I=R/v
=102,6087 / 2
=51,30435 A