Preliminary Concepts Define Conductivity o J=nq Et/(2 m) o=ng t/(2 m)>property of the material:n t J=0E >Units:Coulomb-sec/Kg-meter3 Siemens/meter Define Resistivity p =1/0=2 m /(n q t)Units:Kg-meter3/Coulomb-sec Ohm-meter ■Ohm'sLaw (or often,Ohm-cm) J=OE I/A≥GdV/dL≥G△V/L △V=IL/(A)=I(pL/A) Define Resistance Area A ⊕→⊕→ R=PL/A ⊕→ Only depends on physical properties n,va T,p Basic Electronics-Special Lecture for TIPP 2011 9 Gary Drake,Argonne National Lab-Session 1Basic Electronics – Special Lecture for TIPP 2011 9 Gary Drake, Argonne National Lab – Session 1 Preliminary Concepts  Define Conductivity   Define Resistivity   Ohm’s Law  Define Resistance J = n q E  / (2 m)  = n q  / (2 m)  property of the material: n &  J =  E  = 1 /  = 2 m / (n q ) J =  E I / A   dV / dL   V / L V = I L / ( A) = I (  L / A) R =  L / A n, vd, ,  L Area A  Units: Coulomb-sec/Kg-meter3 = Siemens/meter  Units: Kg-meter3 / Coulomb-sec = Ohm-meter (or often, Ohm-cm)  Only depends on physical properties