There are two main problems when it comes to transmitting electrical energy though wiring. The first is the resistance of the wire, which is a factor determined by the material, its purity and surrounding magnetic impedance factors.

The second problem is the heat generated when the electricity encounters resistance. An extreme example of this would be to to run the entire power supply of one's home though a small copper wire, like the kind used in headphones, which of course is far too dangerous to actually do.

The result would be the wire turning white hot almost instantly before either vaporizing or melting into a molten puddle. By contrast, if a technician were to try to run a simple low voltage audio signal though a huge steel bar line, it would degrade beyond audibility quite quickly due to resistance.

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