Electric Wire Voltage Drop

Overview

Engineering reference data for Electric Wire Voltage Drop in electrical engineering.

Key Formulas

Ohm's Law

$V = IR$

Voltage = Current × Resistance.

Power

$P = VI = I^2R = V^2/R$

Electrical power.

Energy

$E = Pt$

Energy = Power × Time.

Variables

Symbol	Description	Unit
$V$	Voltage	V
$I$	Current	A
$R$	Resistance	Ω
$P$	Power	W

Voltage Drop Specifications for Common Systems

For 240V and 120V single-phase systems, the following table outlines the maximum wire length for a 2% voltage drop across different wire gauges.

Wire Gauge Converter: AWG to Square Millimeters

The American Wire Gauge (AWG) system can be converted to metric cross-sectional area (square millimeters) for international compatibility. The following table provides common conversions.

Interactive Charts

References

• Original Source