Armature Resistance Calculator

Calculate Armature Resistance





Formula

The formula to calculate the Armature Resistance is:

\[ Ra = \frac{V - E}{Ia} \]

Where:

What is Armature Resistance?

An armature resistance is the total resistance seen in a motor with an armature current, voltage, and back e.m.f. It is calculated by subtracting the back e.m.f from the voltage and then dividing by the armature current.

Example Calculation 1

Let's assume the following values:

Using the formula:

\[ Ra = \frac{24 - 20}{2} = \frac{4}{2} = 2 \, \text{ohms} \]

The Armature Resistance is 2 ohms.

Example Calculation 2

Let's assume the following values:

Using the formula:

\[ Ra = \frac{36 - 30}{3} = \frac{6}{3} = 2 \, \text{ohms} \]

The Armature Resistance is 2 ohms.