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Unformatted text preview: AA 320 – Au 2011 Miscellaneous Notes for Week 1 Electrical Conduc;vity Resistivities ( ρ ) of some Materials (ohmm at 20°C) Aluminum 2.65x108 Gold 2.24 x108 Copper 1.724 x108 Silver 1.59 x108 Iron 9.71 x108 Pla;num 10.6 x108 Nichrome 100 x108 Graphite 7.84 x106 Glass ~10 12 Polyethylene ~10 13 Mica ~10 14 Silicon 0.160 I A =1m 2 L =1m ρ R = ρ L A ohms American Wire Gage (AWG) Sizes and Resistances AWG wire size (solid) Diameter (inches) Resistance per 1000 V (ohms) Resistance per 1000 m (ohms) 24 0.0201 25.67 84.2 22 0.0254 16.14 52.7 20 0.0320 10.15 33.2 18 0.0403 6.385 20.9 16 0.0508 4.016 13.2 14 0.0640 2.525 8.28 12 0.0808 1.588 5.21 10 0.1019 0.999 3.28 Kirchhof’s Current Law (KCL) Principle oF conserva;on oF electric charge: At any node (junc.on) in an electrical circuit, the sum of currents ﬂowing into and out of that node is equal to zero¡ I k = k = 1 n ∑ I 2 + I 3 − I 1 − I 4 = Sign convention: I is (+) into node I is () out of node I 1 I 2 I 3 I 4 V The sum of the currents into any node...
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This document was uploaded on 02/05/2012.
 Fall '09

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