Basically what is inside that allows wires to transfer only energy, only data, or both?
In: Technology
There are gonna be exceptions, but in general…
Wires for carrying energy tend to be thicker to minimize loss and heating. They also tend to be unshielded and unbraided – just straight wires. Wires that carry data tend to be braided or shielded, as this reduces noise and interference. Wires intended for both may be thicker *and* braided/shielded.
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