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.
The resistance is:
where - the resistivity of a material (for copper );
l - the length of wire;
A - the cross-sectional area of wire;
d - the diameter of wire;
Answer: 92.7 m.
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