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x................0.09Kv
x= 90v
1A------------1000mA
x--------------8mA
x=0.008A
R = E / I
R= 90v / 0.008A
R=11250 ohm = 11.250 KΩ
Potencia si R= 3 ohm
P= I²*R = (8mA)² * 3ohm = 0.000064A * 3 ohm = 0.000192 W = 0.192mW