Question 7: (1 point) Wire thickness is typcially measured with the term Gauge (AWG). The smaller the gauge, the thicker the wire. One of the most common gauge wire used in household wiring is 12 gauge wire which has a diameter of 2.05 mm. The wiring that comes into a house (rated for 200 amps) is typcially 0 gauge wire which has a diameter of 8.25 mm. The resistivity of the wire is 2x10-8 12m. If the wire from the power pole to the house is 11 m long, what is it's resistance? (The power may be underground in some towns) Ohms If 180 A of current is being used, how much power is dissipated in that wire? Watts. If the same 180 A of current was transmitted through the same length of 12 gauge wire, how much power would be dissipated? Watts. Question 8: (1 point) One way to make very precise resistors that can withstand high temperatures is to use a thin wire of metallic material (wrapped around a ceramic core). It might seem counterintuitive to use good conductors to make resistors, but it's true! Suppose you have 40 AWG Nichrome wire with a cross sectional area of 0.0050 mm?, with a resistivity of 1.1x10-6 12m. What length of wire do you need to make a 740 $2 resistor? Question 9: (1 point) Copper is used in all household wiring. However, Aluminum, being much cheaper, is used in power distribution over large distances. The resistivity of Cu wire is 1.68x108 32m and the resistivity of Aluminum wire is 2.65x108 12m. A typical power line might be 4.4 cm in diameter. Power lines transmit power at very high voltages so that relativley small current can be used. What is the power loss in a single line of Aluminum carrying a current of 200 A through a distance of 300 km? W. What is the power loss in a single line of Copper carrying a current of 200 A through a distance of 300 km? W. If the average cost of electricity in Ontario is $0.125 per KWh, the cost of copper is 11.4 dollars /kg, and the cost of Aluminum is 3.6 dollars/kg, how much time of continuous power transmission is required/(km of line) before the cost savings during use balances the extra cost of using copper. The density of Aluminum is 2700kg/m and the density of copper is 8960 kg/m3 . years