What is the electrical resistance of 18 awg copper wire?

18 AWG copper wire is equivalent to 0.75mm2 nominal. The resistance of a particular copper wire depends on a number of factors like ambient temperature, the type and number of strands of conductor, when plated, the type of plating metal (e.g. tin, silver), etc.

A good value to use for solid #18 AWG copper is 21.8 ohms/km.

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