Specific Resistance by Brandy McNeilin Electrical TablesFebruary 16, 2017 The Specific Resistance (K) of a material is the resistance offered by a wire of this material which is one foot long with a diameter of one MIL. The resistance of a wire is directly proportional to the specific resistance of the material. Material “K” Material “K” Brass 43.0 Aluminum 17.0 Constantan 295 Monel 253 Copper 10.8 Nichrome 600 German Silver 18 % 200 Nickel 947 Gold 14.7 Tantalum 93.3 Iron (Pure) 60.0 Tin 69.0 Magnesium 276 Tungsten 34.0 Manganin 265 Silver 9.7 “K” = Specific Resistance