Question

Calculate the number of electrons that flows per second to constitute a current of one ampere. Charge on an electrons is 1.6*10 raise to power -19 coloumb

Answer 1

Your answer ----

Given, time t = 1s current I = 1A

we know that

I = Q/t

=> Q = I × t

=> Q = 1 × 1 = 1

We know that

Q = ne

where ,

Q = charge

n = number of electron

e = elementary charge ( = 1.6 × 10^-19 )

put the values , we get

1 = n × 1.6 × 10^-19

=> n = 1/(1.6×10^-19)

=> n = 6.25 × 10^18 electrons


Hence, 6.25 × 10^18 electrons flows per second to constitute a current of one ampere.


【 Hope it helps you 】

Answer 2

no of electrons= Q/E
= 1/ 1.6* 10 raise to power - 19
=10/16*10 raise to power -19
then 10 raise to power -19 will go up and then 19 will become positive
=10* 10 raise to power 19 / 16
= as 10/16 = 0.625 * 10 raise to power 19
now we have decreased the power to 18 as we have shifted the decimal.
= 6.25* 10 raise to power 18
Answer is 6.25* 10 raise to power 18