Question

If 6.4 A current flows continuously for 4 seconds through a circuit, find the number of electrons flowing:
(A) 4.8 % 10-19
(B) 4.8 x 1019
(C) 1.6 x 10-19
(D) 16 x 1019​

Answer 1

Question :

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

Given:

• current flowing (I)= 6.4 A
• time = 4 seconds

Solution :

As per the formula,

$current = \frac{charge}{time}$

$charge = current \times time$

$charge(q) = 6.4 \times 4$

$\boxed{q = 25.6 \:C }$

the number of electrons flowing through the circuit is equal to the charge flowing through the wire

$q = ne$

here,

• n = no of electrons
• e = charge on an electron
• q = total charge flowing through the circuit

$n = \frac{q}{e}$

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

$n = 16 \times {10}^{19}$

Answer:

• no of electrons flowing = 16×10^19