Homework 12

Homework 12 - the origin of the difference. Power (Watts) =...

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MSE 230 HW12 (due 04/22, 04/23) Spring 2010 1. Although aluminum has higher resistivity than copper, aluminum is preferred for high-power (long-distance) electrical transmission lines, where, for a given resistance, the weight of the wire per unit length governs the required number of support towers per length of transmission. Quantify the advantage of aluminum in this regard by calculating the ratio of masses of aluminum to copper wire having the same resistance per unit length. 2. A 60W-120V incandescent light bulb has a tungsten filament of finely coiled tungsten wire 0.046 mm in diameter and 580 mm in total length. (a) Calculate the resistivity of the tungsten wire under operating conditions. (b) Compare the resistivity to that given in Callister and explain
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Unformatted text preview: the origin of the difference. Power (Watts) = Voltage (Volts) x Current, I (Amps) 3. Specify a dielectric material and its basic processing for each of the following applications. (a) Insulation for a household electrical extension cord. (b) Lighting receptacle rated for continuous use at 300C. (c) Capacitor (0.1 mm thick dielectric) (d) High-voltage power line insulator (insulating the transmission line from metal tower). 4. (a) Describe the distinction between soft and hard magnetic materials. (b) Give a common application of each type and a specific material of each type, including its basic processing....
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