Understanding your calculation
Method, example and limitations
How the calculation works
A resistive voltage drop follows Vdrop = current × circuit resistance. Conductor length, cross-section, material and return path affect resistance.
Example to check
A total circuit resistance of 0.2 Ω carrying 10 A gives a 2 V drop. On a 12 V supply that is about 16.7%.
Before using the result
Installation design must consider temperature, cable ratings, protective devices and applicable electrical rules. This estimate is not an installation safety assessment.