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6. [0/1 Points] DETAILS PREVIOUS ANSWERS SERPS1O 26.6.P.028. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER Residential building codes typically require the use ot12agauge copper wire (diameter 0.205 cm) for wiring receptacles. Such circuits carry currents as large as 20.0 A. If a wire of smaller diameter (with a higher gauge number) carried that much current, the wire could rise to a high temperature and cause a re. (Table of resistivities) (a) CaEculate the rate at which internal energy is produced in 2.15 m of 12gauge copper wire carrying a current of 20.0 A. 5.12 X If you know the resistance of a wire, how do you calculate the rate at which internal energy is produced for a given current? W (b) Repeat the calculation for a 12~gauge aluminum wire. :IW Explain whether a 12vgauge aluminum wire would be as safe as a copper wire. This answer has not been graded yet. Resistivities and Temperature Coefficients of Resistivity for Various Materials Material Temperature Resistivitya (0 . m) Coefficient a[(C)-1] Silver 1.59 X 10-8 3.8 X 10-3 Copper 1.7 X 10-8 3.9 X 10-3 Gold 2.44 X 10-8 3.4 X 10-3 Aluminum 2.82 X 10-8 3.9 X 10-3 Tungsten 5.6 X 10-8 4.5 X 10-3 Iron 10 X 10-8 5.0 X 10-3 Platinum 11 X 10-8 3.92 X 10-3 Lead 22 X 10-8 3.9 X 10-3 Nichromec 1.00 X 10-6 0.4 X 10-3 Carbon 3.5 X 10-5 -0.5 X 10-3 Germanium 0.46 -48 X 10-3 Silicon 2.3 X 103 -75 X 10-3 Glass 1010 to 1014 Hard rubber ~1013 Sulfur 1015 Quartz (fused) 75 X 1016 All values at 20"C. All elements in this table are assumed to be free of impurities. b See Section 27.4. "A nickel-chromium alloy commonly used in heating elements. The resistivity of Nichrome varies with composition and ranges between 1.00 x 10-6 and 1.50 x 10-602 . m. The resistivity of silicon is very sensitive to purity. The value can be changed by several orders of magnitude when it is doped with other atoms