Answer to Question #169684 in Electric Circuits for Anton

Question #169684

Assume you need a 5.0 ohms resistor and you have available #22 guage wire with a diameter of 6.38 ×10^-4 m.compute the length of wire needed for the resistor.


1
Expert's answer
2021-03-09T15:29:32-0500

The resistance is:


R=ρlA=ρ4lπd2,R=\rho\frac{l}{A}=\rho\frac{4l}{\pi d^2},


where ρ\rho - the resistivity of a material (for copper ρ=1.724108 Ohmm\rho=1.724\cdot10^{-8}\space Ohm\cdot m );

l - the length of wire;

A - the cross-sectional area of wire;

d - the diameter of wire;

l=πd2R4ρ=3.14(6.38104)2541.724108=92.7 m.l=\frac{\pi d^2R}{4\rho}=\frac{3.14\cdot (6.38\cdot 10^{-4})^2\cdot5}{4\cdot1.724\cdot 10^{-8}}=92.7\space m.


Answer: 92.7 m.



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