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CURRENT E LECTRICITY

CURRENT E LECTRICITY. Drift speed. It is the velocity with which the free electrons get drifted towards the positive terminal under the effect of applied electric field. V d = v 1 + v 2 + ……+v n n = a t , where a=- eE m in terms of relaxation time t :-

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CURRENT E LECTRICITY

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  1. CURRENT ELECTRICITY

  2. Drift speed • It is the velocity with which the free electrons get drifted towards the positive terminal under the effect of applied electric field. Vd= v1 + v2 + ……+vn n = at , where a=-eE m in terms of relaxation time t :- vd = =-eEt m

  3. ++++ ++++ - - - - - - - - + + + I - - - I vd l E - - - I Derivation of, I= neAVd • Volume of conductor = Al • No. of free electrons in the conductor= nAl • Total free charge in the conductor => q=nAle • Time taken by this free charge to cross the conductor => t = l/ Vd • Current I = q/t • =nAle l/Vd • I = neAVd A

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