Resistance of a wire essay

It should be noted that it is being presumed that the current is uniform across the cross-section of the wire, which is true only for Direct Current. For Alternating Current there is the phenomenon of " skin effect " in which the current density is maximum at the maximum radius of the wire and drops for smaller radii within the wire. At radio frequencies, this becomes a major factor in design because the outer part of a wire or cable carries most of the current. The inverse of resistivity is called conductivity. There are contexts where the use of conductivity is more convenient.

The first table in combination with the second table offer a good start for selecting a wire gauge for data exchange.
As indicated 24 AWG is one of the standard wire sizes used to transfer data. This link provides a graph of 24 gauge twisted pair wire;
24AWG Frequency vs Attenuation in dB/meters.
So the table provide DC resistance and the link provides AC resistance [for 24 gauge wire].
Which leads to the two reasons to select the correct gauge wire; resistance or Wire Current carrying capacities .
Data or signaling use resistance per gauge, while power lines use Current carrying ability.
Speaker wire is normally around 16AWG [16-Gauge], also 18-gauge and 14-gauge are common.

Resistance of a wire essay

resistance of a wire essay


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