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U = 230 V (napięcie w sieci)
Z prawa Ohma:
I = U/R
I = 230 V /40 Ω = 5,75 A
jednostki:
[I]=V/Ω = V/(V/A) = 1/(1/A) = 1* A = A
Odp. Natężenie wynosi 5,75 A