Armature Resistance Calculator

How to Use the Calculator

1. Enter the supply voltage (V) of your DC motor
2. Input the measured armature current (A)
3. Provide the power input (W) to the motor
4. Optionally, enter the series resistance (Ω) if known
5. Click the "Calculate" button to compute the armature resistance

Understanding Armature Resistance

Armature resistance is an important parameter in DC motors as it affects the motor's performance and efficiency. It can be calculated using Ohm's Law when you know the voltage, current, and series resistance.

Calculation Formula

The calculator uses the formula:

R_a = (V - I_a × R_s) / I_a

Where:

• R_a = Armature Resistance (in ohms)
• V = Supply Voltage (in volts)
• I_a = Armature Current (in amperes)
• R_s = Series Resistance (in ohms)

Applications

This calculator is useful for:

• DC motor diagnostics
• Electrical system design
• Motor performance analysis
• Troubleshooting electrical issues