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R= 0,4 Ko = 0,4 * 1000 omów = 400 omów
U = 220 V
I = U : R = 220 : 400 = 0,55A
U = I * R
U - napięcie [V]
I - natężenie prądu [A]
R - rezystancja / opór [Ohm] 0.4kOhm = 400Ohm
I = U/R
I = 220V/400Ohm
I = 0.55A
I = 550[mA]
I = U/R
I = 220 V /400 omy = 0,55