Physics

[Akhalia Brown]

PLEASE HELP The charge on an electrons is -1.6x10 to the -19C. How many electrons are passing a given point in an electric circuit each second will give rise to a current of 4.0A?

My answer is:

Q=Ixt

-1.6x10^-19=4.0xt

4.0xt=-1.6x10^-19

=-1.6x10^-19x-6.2 divide by 4.0

=2.48x10^-19 or 2.5x10^-19

[FizziksGuy]

First try finding the charge in coulombs, then convert coulombs to electrons.

 

This mini-tutorial may help: http://www.aplusphysics.com/courses/honors/circuits/current.html

 

So, if you use q=It, solve for q in coulombs.

 

Then, convert q (in coulombs) to elementary charges, or electrons, using 1 electron = 1.6*10^-19 C.

 

Does that help?