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Formulary Cable Restistance


Cable cross section
in mm²		Continuous current load
(max.) in A
110
1,520
2,525
435
650
1065

MaterialSpec. electr.
Resistance
Ohm·mm²/m
Silver0,015
Copper0,0178
Gould0,023
Aluminum0,026
Wolfram0,049
Platinum0,089
Tin0,114
Lead0,206
Constantan0,5


The resistance in a solid cable increases with its length and specific resistance and decreases with a larger cross-section. This is the basic formula. In the second formula, only the resistance through the current strength replaces the voltage drop.

   ·l
R=
     A

   ·l
A=
     R

     A·R
l=
     

     A·R
=
     l

Check your calculation!     You need help?
Please enter numbers only in three of the four fields!
A Cross section mm²
Specific resistance Ohm·mm²/m
(Ohm·m)
l Cable length m
R Cable resistance Ohm

        l · · I
A =
         UA

         l · · I
UA =
          A

       A · UA
I =
        · l

       A · UA
l =
        · I

Check your calculation!     You need help?
Please enter numbers only in four of the five fields!
A Cross section mm²
Specific resistance m/Ohm·mm²
l Cable length m
I Current strength A
UA Voltage drop V

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