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Final

PCS 211 Final: Chapter 27
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Department
Physics
Course
PCS 211
Professor
Alexandre Douplik
Semester
Winter

Description
Thus: the charge on each charge carrier.e carrierse•Vtewtof•ieeclwnooffflsitofclecrre,w.hichunrtrent and Resistance : the drift speed (average sThe dcanNtolonfghreavrrstttcdeqiiidristh.e = The rate at which charge flows through a surface. A(v ▯0 inside a conductor! d t) I Q = A(v ▯ ▯charge density = n ▯ lim t, of Electric Current I 0 the number of ▯ ▯ Q d▯ dt dQ t = t) , unit: nqv ▯ n d q A ampere and Q A = s C • • • • Need to findog/cm0Aarea 3density of copper is 8.95Copper Wire Thco:Atr10tesoaneItg/cmtains 8.95 Q: Why aFo1ghteuton/t.s46fdvt1he)=t40lot23=spherinire:s v , and atomic mass is 63.5 g/mol.ectional = ) = 8.48 3 copper weightd 1 m 10 nqA = 8.48 ▯ =8.95 : I 10 m6 = 0= 2.46m/= ▯ mol o▯ coppe= ? charge/ m 2 (8.48 10 10 , carries a current of 10 28▯ ▯ 6 d ▯ atoms 10 g = 10 10 28 5 g/63.5 (g/mol)nqA -4 28 electrons/ mol)(6.02 I m/s m ▯3 ▯ 8.93 )(1.6 10 ▯ ▯ C 3 10 / ▯ s 19 )(3 ▯ 10 6 m )2 Ufotr Unit for R: ohm ( Since J=hmmii:nstteiillobeyreJhe culwJ efine “Riositantts.nldOthme’lecric field: V ▯ = = ▯/ R EL is called the “rrent density” = = : many materials follows: J = : ( ▯ ▯ ▯ ▯ ▯ is the ▯ A L ▯ ▯ ▯ E and V =EL, ▯ I / A = nqv ▯ is called resistance of a conductor E, m) ▯ = do not Resistivity ), JA conductivity : current per unit area 1 ▯ ▯ ▯ obey Ohm’s law d (A/m ▯▯ A L ▯ = ▯ of a conductor A 1V I ▯ ▯▯▯ ” of the conductor. A L ▯ = ▯ ▯ IR E, and ▯ ▯ V is a = IR Between collisions, the speed of ewh(at)Ifaepotrneitdiffeenire?of 1 V is maintained across the wire,tCreefficient WhWenEleEton0sareeagatepasdmofecuRloof=ga.. = I ▯ = A L ▯ R V = 0, the electrons mov= with a drif(1.7locity v 1.71 ▯ V 10 10 ▯ = ~ 10 ▯10 10▯ ▯ ) m 0.59 ▯▯ 10 10 15 . 0 - 3 89-8 A m 3.43.8 a = ▯ ▯ = 590 ▯ m qE 10 10 mA 7 m m ▯ ▯ = ▯10 ▯ 1.7 °( ▯ m7 10▯ ▯1010 10C) 2 10 ]-1 .
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