CHEMANDY ELECTRONICS Suppliers of the unusual

Round Wire Resistance Calculator

  Calculates the d.c. Resistance of a single round wire of common conducting materials using the formula below .

  

Select the conducting material: 

Resistivity (ρ):  x 10-8 Ω/m
Enter the length of the conductor:   cm
Enter the diameter of the conductor:   mm d.c. Resistance:    Ω

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The dc resistance of a conductor is calculated using 

[Formula for dc resistance]

Where ρ = Is the resistivity of the conductor in Ω/m

l = Length in metres                      

A = Cross-sectional area in metres

The values for ρ are from CRC Handbook of Chemistry and Physics 1st Student Edition 1998 page F-88 and are for high purity elements at 20°C.

Table of "bench mark" measurements made in our lab using Enameled Copper Wire
 
Diameter (mm) Length (cm) Voltage (V) Current (A) Measured Resistance (Ω) Calculated Resistance (Ω)
1.0 41.0 0.0091 1.031 0.008826 0.0087596
0.5 41.0 0.0359 1.031 0.03482 0.0350385
0.2 41.0 0.24 1.032 0.2326 0.2189908

This calculator is provided free by Chemandy Electronics in order to promote the FLEXI-BOX

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