The image above represents emissive power.

To compute for emissive power, two essential parameters are needed and these parameters are **Area of Emitting Body (A)** and **Geometric Body Constant (F).**

The formula for calculating emissive power:

Q = AF

Where:

Q = Emissive Power

A = Area of Emitting Body

F = Geometric Body Constant

Let’s solve an example;

Find the emissive power when the area of emitting body is 12 and the geometric body constant is 6.

This implies that;

A = Area of Emitting Body = 12

F = Geometric Body Constant = 6

Q = AF

Q = 12(6)

Q = 72

Therefore, the **emissive power **is **72 W.**

**Calculating the Area of Emitting Body when the Emissive Power and the Geometric Body Constant is Given.**

A = ^{Q} / _{F}

Where:

A = Area of Emitting Body

Q = Emissive Power

F = Geometric Body Constant

Let’s solve an example;

Find the area of emitting body when the emissive power is 32 and the geometric body constant is 8.

This implies that;

Q = Emissive Power = 32

F = Geometric Body Constant = 8

A = ^{Q} / _{F}

A = ^{32} / _{8}

A = 4

Therefore, the **area of emitting body **is **4.**

**Calculating the Geometric Body Constant when the Emissive Power and the Area of Emitting Body is Given.**

F = ^{Q} / _{A}

Where:

F = Geometric Body Constant

Q = Emissive Power

A = Area of Emitting Body

Let’s solve an example;

Find the geometric body constant when the emissive power is 36 and the area of emitting body is 12.

This implies that;

Q = Emissive Power = 36

A = Area of Emitting Body = 12

F = ^{Q} / _{A}

F = ^{36} / _{12}

F = 3

Therefore, the **geometric body constant **is **3.**

Nickzom Calculator – **The Calculator Encyclopedia** is capable of calculating the emissive power.

To get the answer and workings of the emissive power 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 **Radiation Heat Transfer **under **Materials and Metallurgical**

Now, Click on **Emissive Power **under **Radiation Heat Transfer**

The screenshot below displays the page or activity to enter your values, to get the answer for the emissive power according to the respective parameter which is the **Area of Emitting Body (A)** and **Geometric Body Constant (F).**

Now, enter the values appropriately and accordingly for the parameters as required by the **Area of Emitting Body (A) **is **12** and **Geometric Body Constant (F)** is **6**.

Finally, Click on Calculate

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