rafael.x55
New Member
I have CCA CAT5 cable, resistance seemed little high, so I did an experiment. Randomly cut the length and took the conductors out.
9m twisted pair from connected at the end so total length is 18m. Metal core is 0.49mm
Powered from 5V and current is 1.05A, resistance 4.76ohm or 0.26ohm/m. Resistivity 0.26 * PI*0.49e-3^2/4 = 4.9-8 ohm x m
Aluminum should be 2.82e-8. https://en.wikipedia.org/wiki/Electrical_resistivity_and_conductivity
What am I calculating wrong ? Or did they sneak in some iron to shave few cents off ?
9m twisted pair from connected at the end so total length is 18m. Metal core is 0.49mm
Powered from 5V and current is 1.05A, resistance 4.76ohm or 0.26ohm/m. Resistivity 0.26 * PI*0.49e-3^2/4 = 4.9-8 ohm x m
Aluminum should be 2.82e-8. https://en.wikipedia.org/wiki/Electrical_resistivity_and_conductivity
What am I calculating wrong ? Or did they sneak in some iron to shave few cents off ?
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