Unit3FormulaSheetColor - UCSD Summer Session Physics 2B...

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UCSD Summer Session Physics 2B Formula Sheet UNIT 3 – Electric Current, Resistance & Circuits Electric Current Defined charge time q I t == Ampere (A) 1 A = Coulomb/second Instantaneous Current dq I dt = Time-varying current Current Density current unit area I J A Amperes / square meter Carrier Drift Velocity d J nqv = n = carrier density q = carrier charge σ = JE = Conductivity Ohm’s Law microscopic - for materials 1 ρ = = Resistivity VI R = R = resistance Ohm’s Law macroscopic – for devices l R A = (uniform E ) l = length A = cross-sectional area SKIP PP.691-697 Electric Power 22 / PI VIRVR =
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