Question

A metal wire carries a current of $4$ ampere . How many electrons pass through a point in the wire in one second ?

Answer 1

Total charge passed in $1sec=4\times 1=4$ coulomb $(\because Q=i\times t)$

$\therefore$ $1$ Faraday or $96500$ current carried by $=6.023\times {10}^{23}$ electrons

$\therefore$ $4$ coulomb current carried by $=\frac{6.023\times {10}^{23}\times 4}{96500}$

$=2.5\times {10}^{19}$ electrons