How Do Electrons and Ions Affect Current Calculation at Point A?

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To calculate the current at point A in a conducting material, consider the flow of r electrons to the right and l ions to the left, both measured per unit time. The charge of the ions is assumed to be twice that of electrons, which affects the current calculation. Since current is defined as the flow rate of positive charge, the current due to ions is positive, while the current due to electrons is negative due to their opposite flow direction. By calculating the individual currents from both the ions and electrons and summing them, the total current at point A can be determined. Understanding these charge flows is essential for accurate current calculations in conductive materials.
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Homework Statement



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?


Homework Equations





The Attempt at a Solution



No idea! Please help!
 
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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:
Yes, per unit time.

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