Question

To start a car engine, the car battery moves 1.27 ✕ 1021 electrons through the starter motor. how many coulombs of charge were moved?

Answer 1

According to the question we have to use the formula Q=ne

Since we have given

q=1.6*10^(-19) and the car moves the electrons is 1.27*10^21

thus for calculation

1.27*10^21*1.610^(-19)

=2.03*10^3C

=203C

Answer 2

To calculate the amount of charge in coulombs moved by the car battery, we use the formula

`Q = Nq_(e)`

Here, N is the number of electron and
`q_(e)` is the charge of electron.

Given
`N=1.27 *10^(21)  electrons` and we know
`q_(e) =1.6*10^(-19) C/electrons`

Substituting these values in above formula we get,

`Q=1.27 *10^(21)  electrons* 1.6*10^(-19) C/electrons\\\\Q=793.8C`