Inertia of the Magnetic Field: Delay of Current Flow due to Self-inductance
Formal Metadata
| Title |
Inertia of the Magnetic Field: Delay of Current Flow due to Self-inductance
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| Alternative Title |
Trägheit des Magnetfeldes: Induktive Schaltverzögerung
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| Title of Series | |
| Number of Parts |
62
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| Author |
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| Contributors |
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| License |
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. |
| Identifiers |
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| IWF Signature |
C 14838
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| Publisher |
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| Release Date |
2003
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| Language |
English
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| Producer |
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| Production Year |
2002
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Technical Metadata
| IWF Technical Data |
Video-Clip ; F, 5 min 25 sec
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Content Metadata
| Subject Area | |
| Abstract |
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.
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| Keywords | electricity and magnetism self-inductance magnetization |
00:00
Electric current
Inertia
Switch
Magnetism
Artillery battery
00:23
Computer animation
Clock
Orbit
01:02
Colorfulness
Sunrise
01:20
Computer animation
Relaxation (physics)
01:30
Meeting/Interview
Short circuit
Radioactive decay
01:59
Relaxation (physics)
02:35
Meeting/Interview
Taser
02:48
Meeting/Interview
02:53
Sunrise
Thrust reversal
Magnetic core
Dampfbügeleisen
Magnetization
03:52
Circuit diagram
Colorfulness
Minute
05:17
Computer animation
Video
Pohl, Robert Wichard
Electric power distribution
Particle physics
00:00
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
00:24
closed and the current through the tube is
00:27
measured as a function of time the black hand on the clock makes 1 revolution in 100 seconds
00:38
a the current
00:41
increases very slowly in the time and
01:08
the current reaches its saturation value of 15 million pairs only after approximately 40 seconds the rise can be
01:22
approximated with an exponential function with a relaxation time of 6 seconds
01:29
a
01:35
would you will say now the
01:37
battery short circuited and then removed In this way the decay of the current is measured it to follows
02:02
an exponential law with the same relaxation time of 6 seconds In
02:24
a beginning in the now the current flow is
02:39
reversed the here the origin of this
02:45
noble devices revealed electroshock
02:48
that getting built in 1927 FIL going down
02:59
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
03:46
and
03:59
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
