Current Due to Electrical Gradient

Return now to the current driven by the electrical gradient, which can be expressed as

The flux, of a charged particle through a plane at position x in the presence of a voltage gradient dV/ dx will be

Again, u is the mobility of the ion, and C is the concentration of the ion at position x. The factor ZFC is then the concentration of charge at the location of the plane; this is necessary because the voltage gradient dV/ dx acts on charge and ZFC gives the "concentration" of charge at position = x. Equation (A-12) is analogous to Equation (A-10), except it is the voltage gradient rather than the concentration gradient that is of interest.

0 0

Post a comment