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Motor Winding Resistance Calculator

Understanding Motor Winding Resistance:

Motor Winding Resistance Calculator refers to the electrical resistance of the coil windings within an electric motor. These windings consist of wire coils that generate the magnetic fields necessary for the motor’s functionality.

Formula for Calculating Winding Resistance

The formula to calculate the winding resistance (R) is given by Ohm’s law:

R = V/I


  • R is the winding resistance (ohms).
  • V is the voltage across the motor terminals (volts).
  • I is the current flowing through the motor windings (amperes).


Let’s consider a few examples to illustrate the use of the Motor Winding Resistance Calculator:

Voltage (V): 120 volts

Current (I): 5 amperes

Using the formula R = V/I,

The winding resistance (R) is calculated as
R = 120/5 = 24 ohms.

Motor Winding Resistance Calculator


Using the Motor Winding Resistance Calculator:

Input values of Voltage and Current:

  • Voltage: Measure the voltage across the motor terminals using a multimeter or appropriate measuring device. Enter this value in the calculator.
  • Current: Measure the current flowing through the motor windings while the motor is in operation. Input this current value into the calculator.

Calculate Resistance:

After entering the voltage and current values, click the “Calculate” button. This will trigger the calculator to perform the calculation based on the entered values.

Reset for a new Calculation: 

If you wish to perform another calculation, click the “Reset” button. This action will clear all input fields and the calculated value, allowing you to start a new calculation.

The Importance of Winding Resistance


Winding resistance contributes to power loss in the form of heat as current passes through the windings. Higher resistance leads to more power dissipation and decreased overall efficiency.

Voltage Drop:

Higher winding resistance results in a higher voltage drop across the windings when the motor is under load. This can impact the motor’s ability to deliver the required torque.

Temperature Rise:

Excessive winding resistance can lead to elevated temperatures within the motor, potentially causing insulation degradation and reducing the motor’s lifespan.


Monitoring winding resistance can help diagnose various motor issues, such as short circuits, open circuits, or damaged windings.