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R=4Ω U=?
t=10 min=600 s I=?
q=180 C
I=q/t
I=180 C/ 600 s
I=0,3 A
R=U/I /*I
U=R*I
U=4Ω* 0,3 A
U=1,2 V
Odp: Między końcami panuje napięcie 1,2 V.