A hard-drawn copper conductor consists of strands of solid round wires each having a diameter of . in. Determine the resistance of a ft length of this conductor. Neglect any additional resistance due to spiraling
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Resistance of a wire in Ω
R = ρL/A
ρ is resistivity of the material in Ω-m
L is length in meters
A is cross-sectional area in m²
A = πr², r is radius of wire in m
resistivity Cu .e- Ω-m or .e- ohm-mm
.” = . m
ft = m
for each strand: Area = πr² = π(.)² = .e-m²
R = (.e- Ω-m)()/(.e-) = ohms
total resistance = / = . ohms
check my arith
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Billrus is correct, assuming skin effect is ignored.