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current in 1D element

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Hello everybody,
I have a network of 1D elements and I have modeled the current flow inside them using Coefficient from edge PDE. So after running the model I have the voltage in all the structure as shown in the picture.
now I need to calculate current in each branch of the structure. I'm wondering how I can do this. I know that current can be shown in a plot by:

sqrt(uTx^2+uTy^2+uTz^2)/(rho/A)

in which uTx,y,z are the voltage gradient and rho is the resistivity and A is the area of the cross section of each line.

but how can I derive the values?

Thanks a lot

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