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R2 = 1 k ohm = 1000 ohm
R3 = 500 ohm
R total = R1 + R2 + R3 = 1500 + 1000 + 500 = 3000 ohm
v = 1200 v
I = V / R = 1200 / 3000 = 0,4 A
1 kilo ohm= 1000 ohm
500 ohm
Rt= 1500 +1000 +500 = 3000
I = V/R
=1200/3000
=2,5 A