How many times is the resistance of a lead wire greater than that of an iron wire if the lengths
| March 24, 2021 | education
How many times is the resistance of a lead wire greater than that of an iron wire if the lengths and cross-sectional areas of the wires are the same?
These tasks: ρс (specific lead resistance) = 0.21 Ohm * mm2 / m; ρzh (specific resistance of iron) = 0.1 Ohm * mm2 / m.
To compare the resistance of the wires under consideration, we use the formula: k = Rc / Rzh = (ρc * l / S) / (ρw * l / S) = ρc / ρzh.
Let’s perform the calculation: k = 0.21 / 0.1 = 2.1 p.
Answer: The resistance of lead wire is 2.1 times higher.
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