1) 40mA= 40.10(-3)*6.24*10(18)
nombre électrons
libres(1seconde)= 40.10(-3)*6.24*10(18)
= 40*6.24*10(-3+18)
= 249.6*10(15)
= 2.496*10(17)
2)
20min=20*60s=1600s
nombre électrons libres(20min)=
2.496*10(17)*1600
=
2.496*10(17)*1.6*10(3)
=
2.496*1.6*10(17+3)
=
3.9936*10(20)