I was reading a problem that gave:

Potential
Resistivity
Length of wire
Radius of wire

It asked for current:

Current=(area*potential)/(resistivity/length)

Then it asked for electric field in the wire

Can you say

Ed=V.... E=V/d?

Is that the same as E=(resistivity)(current density)... E=ρj; j=I/A

 

What is d in your equation?

And what is the direction of the electric field in the wire, ie which way does the current flow?

 

d is length of the wire. The problem is not set up on a coordinate system with a frame of reference. The direction of current is just opposite of the direction the electron flow. I found out that those two equations come out with the same answer.