How to Calculate and Solve for Current Density | Corrosion

The image above represents current density.

To compute for current density, three essential parameters are needed and these parameters are Number of Electron Charge Present (z), Force (F) and Rate of Heterogeneous Reaction (V).

The formula for calculating current density:

j = zFV

Where:

j = Current Density
z = Number of Electron Charge Present
F = Force
V = Rate of Heterogeneous Reaction

Let’s solve an example;
Find the current density when the number of electron charge present is 6, the force is 4 and the rate of heterogeneous reaction is 8.

This implies that;

z = Number of Electron Charge Present = 6
F = Force = 4
V = Rate of Heterogeneous Reaction = 8

j = zFV
j = (6) (4) (8)
j = 192

Therefore, the current density is 192 A/m².

Calculating the Number of Electron Charge Present when the Current Density, the Force and the Rate of Heterogeneous Reaction is Given.

z = j / FV

Where;

z = Number of Electron Charge Present
j = Current Density
F = Force
V = Rate of Heterogeneous Reaction

Let’s solve an example;
Find the number of electron charge present when the current density is 40, the force is 2 and the rate of heterogeneous reaction is 4.

This implies that;

j = Current Density = 40
F = Force = 2
V = Rate of Heterogeneous Reaction = 4

z = j / FV
z = 40 / 2 x 4
z = 40 / 8
z = 5

Therefore, the number of electron charge present is 5.

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