Magnetic energy © Siemens Stiftung 2018 CC BY-SA 4.0 international

Magnetic energy


Overview graphic:
Two manifestations of magnetic energy are compared: the magnetic energy of a current-bearing coil and that of an elementary magnet.

English, Spanish (CREA), German
Image (139.3 kByte)
Magnetic energy is the energy that is stored in a current-bearing coil in the form of its magnetic field. It is the result of the work that the current has to perform in opposition to the induced voltage (Faraday’s law of induction). Conversely, this magnetic energy is released again in the form of electric current when the magnetic field collapses. Magnetic energy is also stored in a magnetized material. It is equivalent to the work that must be expended in order to align the magnetic dipoles of this material in an external magnetic field. In ferromagnetic materials, the magnetic dipoles align themselves in small zones (“Weiss domains"), even without an external magnetic field. If the Weiss domains are now aligned by an external magnetic field, a permanent magnet is produced.
Incidentally: If a permanent magnet is heated above a critical temperature, it loses its magnetization. The magnetic energy is released as additional heat at this so-called Curie temperature.

Information and ideas:
A simple experiment on magnetization: If you pass a permanent magnet over an iron nail, it magnetizes the nail. What work has to be expended for this, apart from the friction work? Is the permanent magnet or its magnetic energy “used up" in the process?
There are no other media directly related to this file.
Physics; Technology
Grade 7 to 9; Grade 10 to 13
Middle/high school; Vocational training
Chart; Energy; Generator; Magnetism; Power generation; Electric power generator; Form of energy; Graphics
Siemens Stiftung Media Portal
MediaHouse GmbH
© Siemens Stiftung 2018
Stay up-to-date!

About four times a year, we inform you about new media on this portal as well as current studies and events related to OER and STEM.

Media Portal newsletter – register now

About four times a year, we inform you about new media on this portal as well as current studies and events related to OER and STEM.

*Required fields


Liebe Nutzerin, lieber Nutzer,
El Portal de Medios – das spanische Medienportal – ist umgezogen und heißt nun CREA.
Auf CREA finden Sie weiterhin hochwertige Medien für den MINT-Unterricht und vieles mehr.

Dear User,
El Portal de Medios - the Spanish Media Portal - has moved and is now called CREA.
On CREA, you will continue to find high-quality media for STEM education and much more.

Estimado usuario, estimada usuaria,
El Portal de Medios – en español – ha sido trasladado y ahora se llama CREA.
En CREA seguirá encontrando medios de alta calidad para la enseñanza de STEM, y mucho más.

Zu CREA wechseln / Switch to CREA / Cambiar a CREA
CREA - El Portal de Medios para la Enseñanza STEM

Hierbleiben / Stay here / Quédate aquí:
Fenster schließen / Close window / Cerrar ventana