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.**

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

F = ^{j} / _{zV}

Where;

F = Force

j = Current Density

z = Number of Electron Charge Present

V = Rate of Heterogeneous Reaction

Let’s solve an example;

Find the force when the current density is 30, the number of electron charge present is 8 and the rate of heterogeneous reaction is 2.

This implies that;

j = Current Density = 30

z = Number of Electron Charge Present = 8

V = Rate of Heterogeneous Reaction = 2

F = ^{j} / _{zV}

F = ^{30} / _{2 x 8}

F = ^{30} / _{16}

F = 1.88

Therefore, the **force **is **1.88 N.**

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

V = ^{j} / _{zF}

Where;

V = Rate of Heterogeneous Reaction

j = Current Density

z = Number of Electron Charge Present

F = Force

Let’s solve an example;

Find the rate of heterogeneous reaction when the current density is 24, the number of electron charge present is 3 and the force is 4.

This implies that;

j = Current Density = 24

z = Number of Electron Charge Present = 3

F = Force = 4

V = ^{j} / _{zF}

V = ^{24} / _{3 x 4}

V = ^{24} / _{12}

V = 2

Therefore, the **rate of heterogeneous reaction **is **2.**

Nickzom Calculator – **The Calculator Encyclopedia** is capable of calculating the current density.

To get the answer and workings of the current density using the **Nickzom Calculator – The Calculator Encyclopedia. **First, you need to obtain the app.

You can get this app via any of these means:

**Web** – https://www.nickzom.org/calculator-plus

To get access to the **professional **version via web, you need to **register** and **subscribe **for** NGN 2,000 **per** annum** to have utter access to all functionalities.

You can also try the **demo **version via https://www.nickzom.org/calculator

**Android (Paid)** – https://play.google.com/store/apps/details?id=org.nickzom.nickzomcalculator

**Android (Free)** – https://play.google.com/store/apps/details?id=com.nickzom.nickzomcalculator

**Apple (Paid)** – https://itunes.apple.com/us/app/nickzom-calculator/id1331162702?mt=8

Once, you have obtained the calculator encyclopedia app, proceed to the **Calculator Map, **then click on **Materials and Metallurgical **under **Engineering****.**

Now, Click on **Corrosion **under **Materials and Metallurgical**

Now, Click on **Current Density** under **Corrosion**

The screenshot below displays the page or activity to enter your values, to get the answer for the current density according to the respective parameters which is the **Number of Electron Charge Present (z), Force (F) **and **Rate of Heterogeneous Reaction (V).**

Now, enter the value appropriately and accordingly for the parameter as required by the **Number of Electron Charge Present (z)** is **6**,** Force (F)** is **4 **and **Rate of Heterogeneous Reaction (V)** is **8**.

Finally, Click on Calculate

As you can see from the screenshot above, **Nickzom Calculator**– The Calculator Encyclopedia solves for the current density and presents the formula, workings and steps too.