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Cosa (chi) è magnetic core - definizione
Magnetic core
![''(left)'' Eddy currents ''(<span style="color:red;">I, red</span>)'' within a solid iron transformer core. ''(right)'' Making the core out of thin [[laminations]] parallel to the field ''(<span style="color:green;">B, green</span>)'' with insulation between them (''C'') reduces the eddy currents. In this diagram the field and currents are shown in one direction, but they actually reverse direction with the alternating current in the transformer winding.](https://commons.wikimedia.org/wiki/Special:FilePath/Laminated core eddy currents 2.svg?width=200 "''(left)'' Eddy currents ''(<span style=\"color:red;\">I, red</span>)'' within a solid iron transformer core. ''(right)'' Making the core out of thin [[laminations]] parallel to the field ''(<span style=\"color:green;\">B, green</span>)'' with insulation between them (''C'') reduces the eddy currents. In this diagram the field and currents are shown in one direction, but they actually reverse direction with the alternating current in the transformer winding.")
![ferrite]] rod with connection wires glued to the ends. On the right, a molded ferrite rod with holes, with a single wire threaded through the holes.](https://commons.wikimedia.org/wiki/Special:FilePath/Two inductors (437342545).jpg?width=200 "ferrite]] rod with connection wires glued to the ends. On the right, a molded ferrite rod with holes, with a single wire threaded through the holes.")
IN ELECTRICITY AND ELECTRONICS, FERROMAGNETIC MATERIAL AROUND WHICH WIRES ARE WOUND
Laminated core; Magnetic cores; Powdered core; Core loss; Soft iron core; Soft iron; Air-cored; Core losses; Legg equation; Legg's equation
A magnetic core is a piece of magnetic material with a high magnetic permeability used to confine and guide magnetic fields in electrical, electromechanical and magnetic devices such as electromagnets, transformers, electric motors, generators, inductors, magnetic recording heads, and magnetic assemblies. It is made of ferromagnetic metal such as iron, or ferrimagnetic compounds such as ferrites.
Magnetic-core memory
![A 10.8×10.8 cm plane of magnetic core memory with 64 x 64 bits (4 Kb), as used in a [[CDC 6600]]. Inset shows ''word line'' architecture with two wires per bit](https://commons.wikimedia.org/wiki/Special:FilePath/Ferrite core memory.jpg?width=200 "A 10.8×10.8 cm plane of magnetic core memory with 64 x 64 bits (4 Kb), as used in a [[CDC 6600]]. Inset shows ''word line'' architecture with two wires per bit")
![[[Project Whirlwind]] core memory](https://commons.wikimedia.org/wiki/Special:FilePath/Project Whirlwind - core memory, circa 1951 - detail 1.JPG?width=200 "[[Project Whirlwind]] core memory")
![Diagram of the [[hysteresis]] curve for a magnetic memory core during a read operation. Sense line current pulse is high ("1") or low ("0") depending on original magnetization state of the core.](https://commons.wikimedia.org/wiki/Special:FilePath/Ringkernspeicher hysteresekurven.agr.svg?width=200 "Diagram of the [[hysteresis]] curve for a magnetic memory core during a read operation. Sense line current pulse is high (\"1\") or low (\"0\") depending on original magnetization state of the core.")
![This [[microSDHC]] card holds 8 billion bytes (8 GB). It rests on a section of magnetic-core memory that uses 64 cores to hold eight bytes. The microSDHC card holds over one billion times more bytes in much less physical space.](https://commons.wikimedia.org/wiki/Special:FilePath/8 bytes vs. 8Gbytes.jpg?width=200 "This [[microSDHC]] card holds 8 billion bytes (8 GB). It rests on a section of magnetic-core memory that uses 64 cores to hold eight bytes. The microSDHC card holds over one billion times more bytes in much less physical space.")
![US quarter]] for scale](https://commons.wikimedia.org/wiki/Special:FilePath/Magnetic-core memory, 18x24 bits.jpg?width=200 "US quarter]] for scale")
PREDOMINANT FORM OF RANDOM-ACCESS COMPUTER MEMORY FOR 20 YEARS BETWEEN ABOUT 1955 AND 1975
Ferrite core memory; Ferrite-core memory; Core store; Magnetic-Core Storage; Ferrite ram; Magnetic core storage; Core Memory; Main store; Magnetic core memory; Core memory; Core memories
Magnetic-core memory was the predominant form of random-access computer memory for 20 years between about 1955 and 1975.
main store
PREDOMINANT FORM OF RANDOM-ACCESS COMPUTER MEMORY FOR 20 YEARS BETWEEN ABOUT 1955 AND 1975
Ferrite core memory; Ferrite-core memory; Core store; Magnetic-Core Storage; Ferrite ram; Magnetic core storage; Core Memory; Main store; Magnetic core memory; Core memory; Core memories
