One cool demo: I had some iron half-rings (two c-shaped iron cores) which I found in an electronics surplus store (Radar Electric in Seattle.) They had been part of a clamp-on meter which measures alternating current. Just before the faces of the cores were about to make contact, there was a "snap" sound as they came together. The faces had been ground very flat. When pulled apart and then stuck together again (still with no current) the two c-cores did NOT stick together anymore. But if the two c-cores were placed together to form a ring around the cable, something impressive happened. The full form of BIOS is the Basic Input Output System. It is used in the low voltage system. Place the ends of the long cable near each other to form a loop, and then solder the strands in a very special manner to electrically convert the cable into a coil. When the core halves form a complete ring with no air gaps, the magnetic field becomes incredibly strong. When current was switched off, the core halves remained stuck (there was still considerable remanent magnetization, and they formed a ring-shaped permanent magnet.) But this was soft iron transformer core material, an alloy which is designed to be nearly unmagnetizable.

There purpose of electrical cables is to transport the electrical energy from one point to another destination. Aerial and underground power cables compose a major portion of the electrical circuit from the generator to the point of utilization of the electric power. These aerial cables consist of a number of wires, usually of copper or aluminum, twisted (stranded) together in concentric layers. Because aerial cables are frequently subjected to severe environmental stresses, alloys of copper or aluminum are sometimes used to increase the mechanical strength of the cable, although at some detriment to its electrical conductivity. Generally, these are mainly used for connecting a PC sound card, small stereo audio device, or small CD player to any speaker. Drive three hi-amp cables with audio power amplifiers driven by tiny oscillators with 60Hz square waves in 3-phase relationship. Hold the three cables near each other, and it creates Nikola Tesla's spinning magnetic field. There are single core, two core, three core, three and half core & four core are the five type of power cables. The devices which are connected by USB are music players, mice, keyboards, flash drives, and many more. Hardware computers are physical devices that you can touch and feel.

A hoop-coil is the same as a cable, both are electromagnet coils, the only difference is in the number of turns used. If you only want a short "100-amp cable", it's proably easier to wind yourself a hoop-coil using thin insulated wire. Underground feeder cables are very similar to NM cables, but instead of every wire being separately enclosed in thermoplastic, wires are connected together & fixed in the flexible material. In addition, safety circuits such as fire alarms, emergency lighting and control circuits, which are required to remain operational in the event of a fire, must be installed in metal conduits or supplied by MICC conductors. Non-sheathed conductors must not be installed in concrete ducts. Since all the circuit conductors required can be installed in a cable at one time, installation labor is saved compared to certain other wiring methods. And whether you send 100 amps through one wire, or 1.0 amps through each of 100 strands of wire, the magnetism is the same. Loading a cable with too many amps makes it hot, and hot cables are dangerous.The Institute of Engineering and Technology (IET), formerly the Institute of Electrical Engineers (IEE) have decreed that cables can carry loads (measured in amps) according to not just their size, but according to the methods they are fixed (or otherwise) to any given surface.

These cables are very popular due to moisture, changes from high tolerance to temperature & other ecological factors for transmission or communication requirements. Conductors for high temperature Appliances (e.g. electric heaters, irons, pendant lighting, connections within luminaires) must be heat resistant rubber or PVC insulated, with over sheath, stranded copper conductors, and comply with standard. General purpose flexible cables and cords for appliances must be PVC insulated, with a PVC over sheath, stranded copper conductors. Conductive cooling doesn't work well through all that PVC insulation. The insulation of a telephone cable is composed of dry cellulose (in the form of paper tape wrapped around the conductor or paper pulp applied to the conductor) or of polyethylene. But isn't this a form of "cheating"? Whenever there is direct current in a cable, there is ALWAYS a 1-turn coil present. If a conductive object is suspended by a thread and held near the cable, it will rotate, which demonstrates how induction motors work.

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