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P = U*I <--- mamy obie niewiadome
R = U/I
U = I*R <--- zamiast U, podstawiamy to
P = I*R*I
100W = I²*4Ω/:4
I² = 25
I = √25
I = 5 A
U = I*R
U = 5A*4Ω
U = 20 V