DC resistance includes outgoing and return wires. This estimates voltage drop; ampacity, fuses and installation requirements need separate checks.
How to use
- Enter the dimensions and electrical values.
- Adjust the assumptions to match your components.
- Read the result and check the technical limits below.
Formula and assumptions
R = 2ρL/A; ΔV = I × R; ΔV% = 100 × ΔV/V; P = I²R.
Calculated example
- Voltage
- 12 V
- One-way cable length
- 10 m
- Current
- 5 A
- Wire cross-section
- 2.5 mm²
- Voltage drop
- 0.68964 V
- Percentage
- 5.747 %