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PCB Currents: How They Flow, How They React by Douglas Brooks

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16. Current and Trace Temperatures

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16.1. Fundamental Concepts

The resistance of a conductor is proportional to the resistivity of the material and inversely proportional to its cross-sectional area. So any conductor (or wire or trace) has some resistance (we covered this in Chapter 4). For copper wires, tables exist that provide resistance per unit length as a function of wire gauge. The wire gauge is standardized and known as the AWG, or American wire gauge. These tables are provided in almost every electricity and physics handbook, and a good discussion of the table and its origin can be found on the Web.

There are various ways to equate the ...

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