Calculation of urrent

1. Jun 27, 2010

hasan_researc

1. The problem statement, all variables and given/known data

Imagine a point A on a piece of conducting material. If r electrons flow to the right of A and l ions flow to the left, what is the current at A?

2. Relevant equations

3. The attempt at a solution

No idea! Please help!

2. Jun 27, 2010

hikaru1221

Do you mean that r electrons flow to the right of A and l ions flow to the left per time unit? What is the charge of the ion?

Last edited: Jun 27, 2010
3. Jun 27, 2010

hasan_researc

Yes, per unit time.

Let's assume that the charge of the ion is twice the charge on the electron.

4. Jun 27, 2010

graphene

Current is the flow rate of positive charge.
In case of negative charge, current flows opposite to the flow of charge.

Handle each charge separately.

If I ions flow past A per unit time, how much charge has flown past A per unit time?
That gives you the current due to I.

Do the same for the electrons, this time current would flow opposite to their flow.

Then, add up the currents due to the ions and the electrons to get the total current.

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