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Core of an atom. The nucleus contains both positive (protons) and neutral (neutrons) subatomic particles. - O
core - Magnetic material within a coil used to concentrate the magnetic field.
E-core - Laminated form in the shape of the letter "E", onto which inductors and transformers are wound.
ferrite-core inductor - An inductor wound on a ferrite core.
laminated core - Core made up of sheets of magnetic material insulated from one another by an oxide or varnish.

Transformers

Transformers Transformers are one of the major uses of coils. They are made of two or more separate coils of wire wrapped around a common core, normally made of laminated iron sheets. Like so...

electronics-for-beginners.com/pages/page/2090/

Drawing Circuits

Drawing Circuits When designing circuits it is not practical to draw physical likenesses of the components you wish to use. In place of each component a symbol is use to represent it. For example:

electronics-for-beginners.com/pages/page/1070/