tsl132 - A I dQ dt = A n 1 q 1 v 1 n 2 q 2 v 2[A •...

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Current and Current Density Consider drift of Na + and Cl - ions in a plastic pipe filled with salt water. v 1 > 0 , v 2 < 0 : drift velocities q 1 > 0 , q 2 < 0 : charge on ions n 1 , n 2 : number of charge carriers per unit volume + - Cl A E v 2 - q 2 Na + v 1 1 q Net charge flowing through area A in time dt : dQ = n 1 q 1 v 1 Adt + n 2 q 2 v 2 Adt [C] Electric current through area
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Unformatted text preview: A : I ≡ dQ dt = A ( n 1 q 1 v 1 + n 2 q 2 v 2 ) [A] • Current density: ~ J = n 1 q 1 ~ v 1 + n 2 q 2 ~ v 2 [A/m 2 ] • Current equals flux of current density: I = Z ~ J · d ~ A tsl132 – p.1/1...
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