The formula to calculate the Armature Resistance is:
\[ Ra = \frac{V - E}{Ia} \]
Where:
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.
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.
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.