Question

If 6.4 A current flows continuously for 4 seconds through a circuit, find the number of electrons flowing :

• A. $4.8\times {10}^{-19}$
• B. $4.8\times {10}^{19}$
• C. $1.6\times {10}^{-19}$
• D. $16\times {10}^{19}$

Answer 1

The correct option is D $16\times {10}^{19}$

Current flowing through the circuit for $4$ second $I=6.4$ A

Total charge flowing $Q=It$

$\therefore$ $Q=6.4\times 4=25.6$ $Coulomb$

Charge of electron $e=1.6\times {10}^{-19}$ $Coulomb$

Thus number of electrons $n=\frac{Q}{e}$

$\therefore$ $n=\frac{25.6}{1.6\times {10}^{-19}}=16\times {10}^{19}$ electrons