16. Current and Trace Temperatures
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 ...