Physics Post lab 212P 5 Resistance and Ohm s Law Name Section Date Q1 The United States National Electric Code which sets maximum safe currents for rubberinsulated copper wires of various diameters is given in part below Plot the safe current density as a function of diameter Gaugea 4 6 8 10 12 14 16 18 b Diameter mils 204 162 129 102 81 64 51 40 Safe current A 70 50 35 25 20 15 6 3 Q2 Which wire gauge has the maximum safe current density a b A way of identifying the wire diameter 1 mil 10 3 in Q3 The resistance of a resistor is measured at several temperatures as shown below Plot the data and a linear fit to answer the following questions T C R 50 139 100 171 150 203 200 234 250 266 300 298 Q4 Find the value of resistance at 0 C 20 C and 265 C Q5 Find the temperature coefficient of resistance instead of resistivity with a reference temperature of 20 C
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