My Math Forum Drift Velocity.

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 February 5th, 2019, 04:05 PM #11 Banned Camp   Joined: Mar 2015 From: New Jersey Posts: 1,720 Thanks: 125 There is another way to put the data together to check you have the right formula and dimensions without deriving it. Put the formula together so the dimensions are correct. $\displaystyle \frac{\text{coulombs}}{\text{sec}}=(\frac{\text {electrons}}{L^{3}})( \frac{\text{coulombs}}{\text{electron}})(L^{2})( \frac{L}{\text{sec}})$ So all you have to assume is that charge density has the same length units as area. Last edited by skipjack; February 5th, 2019 at 05:16 PM.
 February 5th, 2019, 05:27 PM #12 Global Moderator   Joined: Dec 2006 Posts: 20,472 Thanks: 2039 The denominator that NAC54321 used should be enclosed in parentheses.
 February 6th, 2019, 05:50 AM #13 Banned Camp   Joined: Mar 2015 From: New Jersey Posts: 1,720 Thanks: 125 n=1.00x10^{28} electrons/mm^{3} d=.028 mm A=Pi(.014)^{2} = 6.16x10^{-4} mm^{2} i=8.1 coulombs/sec e=1.60x10^{-19} coulombs/electron v=drift velocity mm/sec i=neAv v=i/neA v=8.1/(1.00x10^{28})(1.60x10^{-19})(6.16x10^{-4}) v= (8.1/(1.6x6.16x10^{5}) v=8.22x10^{-6} mm/sec

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