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Equation
         
    Name Resistivity  
 
    Equation E = ρ ⁢ J ρ = R ⁢ A l  
 
    Definition of terms E = electric field strength, ρ = resistivity, J = current density, R = resistance, A = cross-sectional area, l = length  
 
    Comments

  The resistivity is defined related to the E and J fields as above. It is the reciprocal of conductivity.

  The resistivity ρ of a piece of wire with cross-sectional area A and length l , is as given in the second equation above. 		 
 
    References Electricity and Magnetism , BI Bleaney, B Bleaney, OUP, 3rd edition, 1976  
         


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