User:


Nernst Potential
Storyboard

If a potential is applied to a membrane this will lead to a polarization in which the positive charges move to the negative plate and the negative charges to the positive plate. The difference in concentration however leads to a diffusion that tempts to match the distribution. Nernst's potential is the limit potential over which the applied potential exceeds the tendency to diffuse by polarizing the membrane. For potentials smaller than Nernst's potential, diffusion tends to depolarize the membrane.

>Model

ID:(820, 0)


Nernst Potential
Description

If a potential is applied to a membrane this will lead to a polarization in which the positive charges move to the negative plate and the negative charges to the positive plate. The difference in concentration however leads to a diffusion that tempts to match the distribution. Nernst's potential is the limit potential over which the applied potential exceeds the tendency to diffuse by polarizing the membrane. For potentials smaller than Nernst's potential, diffusion tends to depolarize the membrane.

Variables
Symbol
Text
Variable
Value
Units
Calculate
MKS Value
MKS Units
$T$
T
Absolute temperature
K
$c$
c
Charge concentration
1/m^3
$c_1$
c_1
Concentration 1
mol/m^3
$c_2$
c_2
Concentration 2
mol/m^3
$c_m$
c_m
Concentration weighted number of charges
mol/m^3
$\kappa_e$
kappa_e
Conductivity
1/Ohm m
$I$
I
Current
A
$j$
j
Current density
A/m^2
$D$
D
Diffusion Constant
m/s^2
$\mu_e$
mu_e
Electric mobility
C s/kg
$F$
F
Faraday constant
C/mol
$ds$
ds
Infinitesimal distance
m
$c_1$
c_1
Ion concentration of type 1
mol/m^3
$c_2$
c_2
Ion concentration of type 2
mol/m^3
$c_3$
c_3
Ion concentration of type 3
mol/m^3
$\Delta c$
Dc
Molar concentration difference
mol/m^3
$\varphi_m$
phi_m
Nernst Potential
V
$z_1$
z_1
Number of charges of ion type 1
-
$z_2$
z_2
Number of charges of ion type 2
-
$z_3$
z_3
Number of charges of ion type 3
-
$d\varphi$
dphi
Potential difference
V
$S$
S
Section of Conductors
m^2
$v$
v
Speed
m/s
$z$
z
Valency
-

Calculations

First, select the equation:   to ,  then, select the variable:   to 
Symbol
Equation
Solved
Translated

Calculations

Symbol
Equation
Solved
Translated

 Variable   Given   Calculate   Target :   Equation   To be used


Equations

Examples

ID:(820, 0)