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Physikalische Experimente nach Robert Wichard Pohl (1884 - 1976)   [Series Title]

The Physics Experiments of Robert Wichard Pohl (1884 - 1976)   [Series Title]
Inertia of the Magnetic Field: Delay of Current Flow due to Self-inductance   [Title Translation]
Trägheit des Magnetfeldes: Induktive Schaltverzögerung   [Other Title]
Year of origin: 2002
Genre: Documentary Film
Locations of shooting: n/a

Author: Klaus Lüders
  Robert Otto Pohl
  Gustav Beuermann
  Konrad Samwer
Assistant: Verena Gruber
Producer: Walter Stickan
First released by: IWF (Göttingen)
Distributor: IWF (Göttingen)
Sound: Frank Polomsky
Production company: IWF (Göttingen)
Editing: Abbas Yousefpour
Photography: Kuno Lechner

Keywords: Elektrizitätslehre, Magnetisierung, Schaltverzögerung, Selbstinduktion, electricity and magnetism, magnetization, self-inductance
The switching on and off of electric devices is usually characterized by their instantaneous response. The presence of inductors with large self-inductance can, however, cause considerable delays. Iron cores can lead to additional delays resulting from a change of the magnetization. Such delays, extending over minutes, will be shown here. A large copper spool is wound on a heavy closed iron core. It can be connected with a switch to a 2 volt accumulator (lead-acid battery) and a projection ammeter of short response time (less than 1 sec). The time is measured with a large, hand-operated (historic) stopwatch. These experiments always are extremely surprising, considering that we tend to associate electric phenomena with the idea of the instantaneous, the timeless.

Version 1
Language: deu, eng
Sound: n/a
Aspect: n/a
Duration: 5 min 25 sec

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