# Homework Help: Finding the number of electrons?

1. Aug 2, 2017

### Arij

1. The problem statement, all variables and given/known data
I was asked to find number of electrons passing through a wire giving only resistance.

2. Relevant equations
V=IR
I = dQ/dt
n= Q/e

3. The attempt at a solution
It's pretty straight forward, with direct substitution of the equations with the written order.
I could attempt this assuming V = 1 V but, is there another way to get this with only the value of R and I'm not seeing it??

2. Aug 2, 2017

### RememberYourAngles

Do note that you also have to assume the time (t) as well as the voltage.
Therefore I believe the values of V and Time(t) don't matter so long as they have a relationship such that V times Time t gives you 1, given the relationship they have in the derived equation.

3. Aug 2, 2017

### Arij

forgot to mention that he did mention it's number of electrons passing through xx ohms in one second.

Correct me if wrong, your suggestion is:
n=Q/e=Idt/e= (V/R)dt/e=(V/dt) R/e and assuming V/dt = 1 but I'm not how does that work if I look at it dimensionally using units.