Inertia of the Magnetic Field: Delay of Current Flow due to Self-inductance

Video thumbnail (Frame 0) Video thumbnail (Frame 568) Video thumbnail (Frame 929) Video thumbnail (Frame 1547) Video thumbnail (Frame 1660) Video thumbnail (Frame 2008) Video thumbnail (Frame 2170) Video thumbnail (Frame 2435) Video thumbnail (Frame 2965) Video thumbnail (Frame 3210) Video thumbnail (Frame 3873) Video thumbnail (Frame 4068) Video thumbnail (Frame 4189) Video thumbnail (Frame 4321) Video thumbnail (Frame 4440) Video thumbnail (Frame 5033) Video thumbnail (Frame 5789) Video thumbnail (Frame 5900) Video thumbnail (Frame 7924)
Video in TIB AV-Portal: Inertia of the Magnetic Field: Delay of Current Flow due to Self-inductance

Formal Metadata

Inertia of the Magnetic Field: Delay of Current Flow due to Self-inductance
Alternative Title
Trägheit des Magnetfeldes: Induktive Schaltverzögerung
Title of Series
Number of Parts
CC Attribution - NoDerivatives 3.0 Germany:
You are free to use, copy, distribute and transmit the work or content in unchanged form for any legal purpose as long as the work is attributed to the author in the manner specified by the author or licensor.
IWF Signature
C 14838
Release Date
Other Version(s) German
IWF (Göttingen)
Production Year

Technical Metadata

IWF Technical Data
Video-Clip ; F, 5 min 25 sec

Content Metadata

Subject Area
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.
Keywords electricity and magnetism self-inductance magnetization
IWF Classification physics electricity and magnetism
Electric current Inertia Switch Magnetism Artillery battery
Computer animation Clock Orbit
Colorfulness Sunrise
Computer animation Relaxation (physics)
Meeting/Interview Short circuit Radioactive decay
Relaxation (physics)
Meeting/Interview Taser
Thrust reversal Magnetic core Sunrise Dampfbügeleisen Magnetization
Circuit diagram Colorfulness Minute
Computer animation Video Pohl, Robert Wichard Electric power distribution Particle physics
was a flu you see With this experiment it will be shown that electric currents can react very sluggishly given the right circumstances for this a to volt battery is connected to a large troop as long as the switch is
closed and the current through the tube is
measured as a function of time the black hand on the clock makes 1 revolution in 100 seconds
a the current
increases very slowly in the time and
the current reaches its saturation value of 15 million pairs only after approximately 40 seconds the rise can be
approximated with an exponential function with a relaxation time of 6 seconds
would you will say now the
battery short circuited and then removed In this way the decay of the current is measured it to follows
an exponential law with the same relaxation time of 6 seconds In
a beginning in the now the current flow is
reversed the here the origin of this
noble devices revealed electroshock
that getting built in 1927 FIL going down
the current rise is even more slowly and is not exponential the slow rise is caused by the slow reversal of the magnetization of the iron core in the chair and
the of the lowly after approximately 2 minutes has saturation being reached the truly unexpected sluggish behavior in such a simple electrical circuit and a