Calculation
R = ρ · L / A
Long, thin conductors have higher resistance; material and temperature determine ρ.
R = ρ·L/A
Conductor resistance from material and geometry
Long, thin conductors have higher resistance; material and temperature determine ρ.
MINTSI
02
Result
Select a target and calculate.
Understand the inputs
- Conductor resistance R — Ohmic resistance at the stated temperature.
- Resistivity ρ — Material property, e.g. copper about 0.0175 Ω·mm²/m at 20 °C.
- Conductor length L — Electrical length; include both go and return conductors for voltage drop.
- Conductor area A — Metal cross-section normal to current flow.
Example
10 m of 10 mm² copper: 0.0175 Ω.
Assumptions and limits
DC, constant temperature and homogeneous cross-section.
Sources