A wire is composed of one or several flexible wires, wrapped with a light and soft protective layer; A cable is composed of one or several insulated wires, with a tough outer layer made of metal or rubber. Good quality wires are generally within the specified weight range. The commonly used plastic insulated single stranded copper core wire with a cross-sectional area of 1.5 has a weight of 1.8-1.9kg per 100m; 2.5 plastic insulated single stranded copper core wire, weighing 2.8-3.0kg per 100m; 4.0 plastic insulated single stranded copper core wire, with a weight of 4.1-4.2kg per 100m, etc. Poor quality wires have insufficient weight, either insufficient length, or excessive impurities in the copper core of the wires.

Electromagnetic wire is an insulated wire that generates a magnetic field after being energized or induces current in the magnetic field. It is mainly used for winding motors and transformers, as well as other related electromagnetic equipment. Its conductor is mainly copper wire, which should have a thin insulation layer and good electrical and mechanical properties, as well as heat resistance, moisture resistance, solvent resistance, and other properties. Choosing different insulation materials can achieve different characteristics.