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U = 30V
R = U/I
R = 30/2
R = 15 Ω
U = 50 V
R = U/I
I = U/R
I = 50/15
I = 3całe1/3 A
Gdyby napięcie wzrosło do 50V, natężenie miałoby wartość 3całe1/3 A.
50V - x
30V - 2A
100 - 30x/30
Wynik: 3,(3)