Physics II - Electric Current

4.1: Ohm’s law, series and parallel circuits. Ohm’s law relates three variables: current, (I); potential difference (V), and resistance (R). The relation between these three quanities is . V = IR (4.1) In a microscopic form, Ohm’s law in terms of the current density, j, field E in a region as j = σE (4.2) where σ is the conductivity measured in (ohm-metre)-1. The combined (equivalent ... ................
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