Arturo O. answered • 12/19/19
Experienced Physics Teacher for Physics Tutoring
I will explain the steps, but YOU do the work.
V = battery voltage (given)
R = resistance (given)
t = time interval (given, but convert to seconds)
e = electron charge (look it up in units of coulombs)
n = number of electrons = ?
Current:
i = V/R
Total charge:
q = it
Number of electrons:
n = q/e
Put it all together:
n = (V/R) t/e
Now plug in the values of V, R, t, and e, and get the number of electrons.
Arturo O.
The two equations are equivalent. Indeed, I did explain what q is. I defined it as the total charge q = it. It is in the steps.12/19/19
Michael V.
Thank you Arturo you have been a tremendous help :)12/20/19
Michael V.
By the way my final answer was 1020031.1603 electrons.12/20/19
Arturo O.
You are welcome, MIchael. But I get a different answer: (V/R) t / e = (9/20) [5(60)] / (1.6x10^-19) = 8.44 x 10^20 electrons Check your units.12/21/19
Michael V.
These are the equations I used and the answers I=9/20 = 0.45 Q= (0.45)(300) = 135 N= 135/1.6e-19 = 1020031.160312/21/19
Michael V.
I also get the same answer when I use the other equation for n12/21/19
Arturo O.
Your last equation should be N = 135/(1.6 x 10^-19) = 8.44 x 10^20. I think you are entering the value of the electron charge incorrectly in your calculator.12/21/19
Michael V.
In these series you gave two eqautions both equal N does it matter which one I chose and what is Q you didnt add it to the list of variables12/19/19