AA 320 Miscellaneous Notes Week #1

AA 320 Miscellaneous Notes Week #1 - AA 320 – Au 2011...

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Unformatted text preview: AA 320 – Au 2011 Miscellaneous Notes for Week 1 Electrical Conduc;vity Resistivities ( ρ ) of some Materials (ohm-m at 20°C) Aluminum 2.65x10-8 Gold 2.24 x10-8 Copper 1.724 x10-8 Silver 1.59 x10-8 Iron 9.71 x10-8 Pla;num 10.6 x10-8 Nichrome 100 x10-8 Graphite 7.84 x10-6 Glass ~10 12 Polyethylene ~10 13 Mica ~10 14 Silicon 0.1-60 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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AA 320 Miscellaneous Notes Week #1 - AA 320 – Au 2011...

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