Question

If one billion electrons travel through a conductor in one nano second , how many micro amperes of current are flowing through it?

Answer 1

Current I = q / t
Charge of one electron = e = 1.60217662 × 10^-19 coulombs
Charge of one billion electrons = e × 10^9 = 1.60217662 × 10^-10 coulombs
t = 1ns =10^-9sec
So
I=1.60217662 × 10^-10 /10^-9
= 1.60217662 × 10^-1 A
=1.60217662 × 10^5 micro Ampere

Hope this helps :)