If 16mA of current flows through a conductor in one second; the number of electron transported per seconds is? [1 electronic charge = 1.6 x 10^-19C]

A. 1.0 x 10²⁰
B. 1.0 x 10^-18
C. 1.0 x 10^-17
D. 1.0 x 10¹⁷

Correct Answer:

Option D – 1.0 x 10¹⁷

Explanation

Current (I) = ^q/_t → q = i x t
= 16 x 10^-3 x 1
= 1.6 x 10^-2C
But 1.6 x 10^-19C = I electronic charge
1 coulomb = 1 / (1.6×10^-19)
∴ 1.6 x 10^-2 coulombs = 1 / (1.6×10^-19) x 1.6×10^-2 / 1
= 1.0 x 10^-2 x 10¹⁹
= 1.0 x 10¹⁷