Why the wires are made of aluminum wire or copper wire core, but also wrapped in plastic outside
wrapped in plastic leather is to insulation safety, or else we have to wear insulated gloves and insulated shoes every day ah
The same length and cross section of the wire, silver wire resistance is minimal, followed by copper wire, aluminum wire, out of price and resistance, copper and aluminum better. But aluminum is easy to be oxidized, and now most of the wire is made of copper wire.
And heat and resistance, the greater the resistance, the greater the heat.
The current flow on the wire will heat, this part of the heat is not on the use, and the temperature is too high there are security risks.
