![]() Longer wires provide greater resistance than shorter wires. A wire’s electrical resistance depends on its length and thickness. ![]() (e.g., AWG 4 wire requires 7.918 feet, while AWG 40 requires 34.364 feet.) Feet per pound refers to the number of feet of wire needed to reach one pound in weight. The wire’s cross-sectional area doubles every time it descends three levels (e.g., a six-gauge wire has double the cross-sectional surface area of a nine-gauge wire). The cross-sectional area of round wires can be calculated using the formula A= πr2, with r representing half of the diameter. The diameter doubles every time the gauge decreases by six levels (e.g., a three-gauge wire has double the diameter of a nine-gauge wire). ![]() For example, AWG 4 is 0.2043 inches in diameter, and AWG 40 is. Wire gauges range from low numbers to high numbers, with smaller numbers referring to smaller diameters and larger numbers representing larger diameters. ![]() Given its gauge, industry professionals can determine the following about a particular wire: The gauge of a wire imparts more than information about its thickness. Relationships Between Wire Gauge and Other Technical Specs
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