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Current Density from Volts & Ohms
J =
V
RA
  =   V
(ρLA)/A
  =   EL
ρL
  =   E
ρ
  =   σE
where:
J = current density (joules)
V = electric field (volts)
R = resistance (ohms)
A = area (meters2)
ρ = resistivity
L = length (meters)
E = electric field
σ = conductivity

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