Editing Magnetic core (section)

=== "E" core ===
E-shaped core are more symmetric solutions to form a closed magnetic system. Most of the time, the electric circuit is wound around the center leg, whose section area is twice that of each individual outer leg. In 3-phase transformer cores, the legs are of equal size, and all three legs are wound.
{{multiple image
| align     = center
| direction = horizontal
| width     = 200
<!-- Image 1 -->
| image1    = E_core.png
| caption1  = Classical ''E'' core
<!-- Image 2 -->
| image2    = EFD_core.png
| caption2  = The ''EFD''' core allows for construction of inductors or transformers with a lower profile
<!-- Image 3 -->
| image3    = ER_core.png
| caption3  = The ''ETD'' core has a cylindrical central leg.
<!-- Image 4 -->
| image4    = EP_core.png
| caption4  = The ''EP'' core is halfway between a ''E'' and a ''pot'' core
}}

==== "E" and "I" core ====

Sheets of suitable iron stamped out in shapes like the ([[sans-serif]]) [[Letter (alphabet)|letters]] "E" and "I", are stacked with the "I" against the open end of the "E" to form a 3-legged structure. Coils can be wound around any leg, but usually the center leg is used. This type of core is frequently used for power transformers, autotransformers, and inductors.

<!-- diagram would be good here-->
{{multiple image
| align     = center
| direction = horizontal
| width     = 200
<!-- Image 1 -->
| image1    = ER core assembly.png
| caption1  = Construction of an inductor using two ''ER'' cores, a plastic bobbin and two clips. The bobbin has pins to be soldered to a [[printed circuit board]].
<!-- Image 2 -->
| image2    = ER core assembly exploded.png
| caption2  = [[Exploded view]] of the previous figure showing the structure
}}

==== Pair of "E" cores ====

Again used for iron cores. Similar to using an "E" and "I" together, a pair of "E" cores will accommodate a larger coil former and can produce a larger [[inductor]] or [[transformer]]. If an air gap is required, the centre leg of the "E" is shortened so that the air gap sits in the middle of the coil to minimize [[magnetic fringing|fringing]] and reduce [[electromagnetic interference]].