The resistance of copper wire may be important in situations where an exact voltage must be supplied to a load. Knowing the resistance of the wire allows you calculate the voltage drop across the wire. Wire Resistance Formula The resistance of a copper wire is equal to Rho x (length / wire cross sectional area). For copper, Rho = 10.35 ohms-circular mils/foot (cmil/ft.) at 75 degrees Fahrenheit. Conductor resistance increases as temperature increases, and lowers as temperature decreases. enameled wire diameter Sample Calculation For 2,500 feet of 14 gauge THHN wire, we can calculate the resistance of the wire as follows: The cross sectional area of 14 gauge wire is 4,107 circular mils. Applying the formula, we have 10.35 ohms-cmil/ft x (2,500 feet / 4,107 circular mils) = 6.3 ohms across 2,500 feet of 14 gauge wire at 75 degrees Fahrenheit. Lead after evaporation zone into the curing zone, the first occurring in a curing zone is paint chemical response, crosslinking namely paint group. Such as polyester resin paint is linear structure via cross-network structure combined into a film. Curing echo very important,0.87mm magnet copper wireit is directly related to the number of wire function. The curable enough influence enameled flexibility, solvent resistance, scratch, softening breakdown. Although sometimes when the function is good, but the film invariance poor, after a period of storage, (wire) function data loss, and even failure. Suppose excessive curing, the film becomes brittle, flexibility, thermal shock decline. Most wire can determine the color of the film via the degree of cure, but because enameled via multiple baking, only the appearance of discrimination is not detailed. When the internal curing is not enough, magnet wire for transformeran external curing is very insufficient, enameled color is very good, but the release of poor thermal aging implemented, can the film sleeve or large peeling. On the contrary, internal curing well, but the lack of an external curing, wire color is also good, but poor scratch resistance.
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