# Lineres Function

Calculation of the DC resistance of an electrical cable

## Calculate the line resistance

The Lineres function calculation of the DC resistance of an electrical cable. The parameters for the length l and the cross-sectional area A can be real numbers or lists of real numbers.

The third argument is the specific resistance. The value can be transferred as a real number or as a text string with the element symbols "Al" (silver), "Cu" (copper) or "Fe" (iron).

### Syntax

Lineres (l, A, R)

Lineres (l, A, "Cu")

### Legend

 l Length in meter A cross-sectional area in mm2 R specific resistance in Ohm

### Example

R=Lineres(30, 1.5, 1/56)=357.1mΩ

R=Lineres(30, 1.5, "Cu")=357.1mΩ

### Formula

$$\displaystyle R_L=\frac{l}{A}ρ$$

A table with specific resistances of different materials can be found here