Current and Resistance

6.1Electric Current ... 6-2
6.1.1Current Density ............................................................................................ 6-2
6.2Ohm's Law ... 6-5
6.3Summary ... 6-8
6.4Solved Problems .................................................................................................. 6-9
6.4.1Resistivity of a Cable ................................................................................... 6-9
6.4.2Charge at a Junction ................................................................................... 6-10
6.4.3Drift Velocity ............................................................................................. 6-11
6.4.4Resistance of a Truncated Cone ................................................................. 6-12
6.4.5Resistance of a Hollow Cylinder ............................................................... 6-13
6.5Conceptual Questions ........................................................................................ 6-14
6.6Additional Problems .......................................................................................... 6-14
6.6.1Current and Current Density ...................................................................... 6-14
6.6.2Resistance of a Cone .................................................................................. 6-14
6.6.3Current Density and Drift Speed ................................................................ 6-15
6.6.4Current Sheet ............................................................................................. 6-15
6.6.5Resistance and Resistivity .......................................................................... 6-16
6.6.6Charge Accumulation at the Interface ....................................................... 6-16

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