COILS

Coils consist of a wire which is wound around a body of fresh air or some special ferrite materials. A magnetic field is induced inside a coil which actually points out the difference between a coil and a 'normal' stretched wire.

The symbol of a coil de-camouflages it to what it is: a bent wire. If this can't shock you, you're totally normal. BUT: There is more about that little piece of bent wire. For example: Did you know, that theoretically speaking, a coil in a circuit never ends ? Yes, and did you ever think of the possibility that it is not us making experiments on white mice, but vice versa ? - No, in fact, a coil that is connected to any wire never ends, because even a flat wire can be called a little coil, so connecting a coil to a circuit via 200 feet of copper wire will change the coil's value, as you can imagine.

The most interesting issue about coils is that they are a little bit socially attracted by other coils. This is, why they often happen to appear as couples or even triples or even lots. Not that they could not work on their own, but often they have a partner attached to them by a metal core. Despite that social orientation nobody has ever seen two coils making a third one. Maybe they don't want to.

If you should come around a couple of coils held together by some metal body, you should know: This is a transformer. The symbol for it is as follows (or similar to it):