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4 min---x
4 minuty to 240s
240:20=12
6*12=72
Odp. 72C
q=I*t
I=q/t=6C/20s=0,3A
q1=0,3A*240s=72C
2.
q=I*t
100mA=0,1A
q=0,1A*60s=6C
ładunek elektronu e=1,6*10^-19 C
n=q/e=6/(1,6*10^-19)=3,75*10^19 elektronów