I = V / R = 2 A
R = V / I = 4,5 / 2 = 2,25 Ohm
I' = 9 / 2,25 = 4 A
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I = V / R = 2 A
R = V / I = 4,5 / 2 = 2,25 Ohm
I' = 9 / 2,25 = 4 A