Determining Number of Electrons moving through a lamp.

[Dannytee]

The question I'm having trouble is:

A neon indicator lamp needs 90v to conduct. It then draws out 0.5mA.
Calculate the number of electrons moving through the lamp each second.

so...

Electron Charge - 1.6*10^-19
Voltage - 90
Current - 0.5mA​

Any sort of help would be helpful!

 

[Integral]

What are the units on the electron charge Number?

What is the definition of current?

We need you do show some effort before more help can be given.

 

[colinven]

Recall, 1 electron has charge e=1.6×10^{-19} C, this means that 100 electrons would have charge 100e, etc. Current I is a measure of the change in charge per change in time. I=\frac{ΔQ}{Δt}. You can think of current as a flow of electrons, and the current is a measure of how many electrons pass a fixed point per some time interval.

You know the current already as 0.0005 A, so you should be able to find the amount of charge after 1 second by setting Δt=1s and solving for ΔQ in the above equation. ΔQ, like I said can be thought of as an amount of electrons that passed some fixed point in 1 second.

Now ask yourself how many electrons do I have after 1 second, according to ΔQ?

It's a simple ratio between how many electrons are in 1e, and how many electrons are in your ΔQ. It should look like this:

\frac{1.6×10^{-19}C}{1e}=\frac{ΔQ}{Ne}. where N is the number of electrons that passed through the wire in 1 second.