Voltage Drop
Voltage drop and power loss in copper and aluminium wire from length, cross-section and current.
Voltage drop is the part of the voltage lost across the resistance of the wires.
Formulas
R = ρ · l / S, ΔU = 2 · I · R
Three-phase circuits use √3 instead of 2. Resistivity: copper 0.0175, aluminium 0.028 Ω·mm²/m. This is an educational estimate: real wiring must follow the applicable codes.
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