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n=12*10^19 elektronów
e=1,6*10^-19 C
U=80V
R=?
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q=n*e=12*10^19 * 1,6*10^-19 C=19,2C
q=I*t
I=q/t=19,2C/2s=9,6A
I=U/R
R=U/I=80V/9,6A=8,3Ω