How this calculator works
Enter the values for first value, second value and review the units before calculating.
Formula / method
Voltage drop = current × (2 × length × resistance per meter)
Worked example
10 A through a 20 m run at 0.001 Ω/m drops 0.4 V round trip.
Assumptions and limitations
The supplied resistance is per meter and the return path has the same length and resistance.
Temperature, connectors, AC reactance and installation code are not included.