Date: Thu Nov 2 11:37:46 2006

Author: Richard Heckathorn

Subject: Re: jumping rings "launcher" and load

Post:
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Greetings,

=20

I would put a circuit breaker into the circuit in
case the core was not in. I also have a push
button momentary on switch in the circuit.

=20

My circuit breaker is a piece of aluminum foil. I
put a couple of bar magnets in the coil, push the
on switch, the fuse blows and the bar magnets are
magnetized.

=20

Dick

=20

=20

Helping teachers who facilitate, motivating
students who learn.

Dick Heckathorn 14665 Pawnee Trail Middleburg
Hts, OH 44130 440-826-0834

www.cvcaroyals.org/~rheckathorn/

Adjunct Physics Teacher - Baldwin Wallace College

Physics is learning how to communicate with ones
environment so that it will talk back.

=20

-----Original Message-----
From: tap-l-owner@lists.ncsu.edu
[mailto:tap-l-owner@lists.ncsu.edu] On Behalf Of
Gerald Zani
Sent: Thursday, November 02, 2006 10:41 AM
To: tap-l@lists.ncsu.edu
Subject: Re: [tap-l] jumping rings "launcher" and

=20

The iron rods do not cause the load to be
inductive.

The geometry and number of the loops of wire
create the induction. And the rate of change of
the current through the self inductive loops
creates the inductive reactance.

The core simply multiplies the magnitude of the
induction (by about 100). The core does this by
concentrating and strengthening the B field in the
core. The core material does not initiate the
induction. =20

-- JZ

At 10:22 AM 11/2/2006, you wrote:

This is true, John.

Is the "missing key" to this problem - the iron
rods in the jumping
ring solenoid? These rods (like the layered metal
in the transformers)
cause the load to be inductive (and therefore
increase
the resistance).
Santos

> I believe these act more like inductive loads.
> John
> ----- Original Message -----
> From: Krishna Chowdary
> To: tap-l@lists.ncsu.edu
> Sent: Wednesday, November 01, 2006 10:27 PM
> Subject: [tap-l] jumping rings "launcher" and
>
>
> Tappers:
>
> I'm missing something obvious, I think.
>
> In the plans I've seen for homemade jumping
rings, I see nice mounts
> that are essentially air core solenoids. I
think that they are intended
> to be plugged into a wall outlet. Why don't
they blow a fuse when
> switched on? Aren't they just essentially short
circuits? What's the
>
> (when I was a kid, I wrapped many yards of
wire around a can. I spliced
> into a plug. My friend Wes plugged the plug
into a wall outlet in my
> basement. Luckily I still have my friend Wes.
But what a disaster!).
>
>
> --
> regards
> -Krishna
>
> Krishna Chowdary
> Department of Physics & Astronomy
> Bucknell University

Gerald Zani e-mail:
Gerald_Zani@brown.edu
Manager of Demonstrations phone: (401)
863-3964
Department of Physics FAX: (401)
863-2024
Brown University Providence, RI
02912-1843 USA
=20
http://www.physics.brown.edu/physics/demopages/dem
o/
http://www.physics.brown.edu/physics/userpages/sta
ff/Gerald_Zani/index.html
=20
Do a little more of that work which you have
confessed to be good,
Which you feel that society and your most Just
Judge rightly demand of you.
Cultivate the tree which you have found to bear
If you have any experiments you would like to try,
try them.=20

Henry David Thoreau, Journal entry, 1850.

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Greetings,

I would put a circuit breaker into =
the
circuit in case the core was not in. I also have a push button =
momentary
on switch in the circuit.

My circuit breaker is a piece of =
aluminum
foil. I put a couple of bar magnets in the coil, push the on switch, the =
fuse
blows and the bar magnets are magnetized.

Dick

Helping teachers =
who
facilitate, motivating students =
who
learn.

Dick
Heckathorn 14665 Pawnee Trail Middleburg Hts, OH
44130 440-826-0834

www.cvcaroyals.org/~rheckathorn/

Physics Teacher - Baldwin Wallace College

Physics
is learning how to communicate with ones environment so that it will =
talk back.

-----Original =
Message-----
From: =
tap-l-owner@lists.ncsu.edu
[mailto:tap-l-owner@lists.ncsu.edu] On Behalf
Of Gerald Zani
Sent: Thursday, November =
02, 2006
10:41 AM
To: =
tap-l@lists.ncsu.edu
Subject: Re: [tap-l] =
jumping rings

The iron rods do not cause the load to be =
inductive.

The geometry and number of the loops of wire create the induction. =
And
the rate of change of the current through the self inductive loops =
creates the
inductive reactance.

The core simply multiplies the magnitude of the induction (by about =
100).
The core does this by concentrating and strengthening the B field in the
core. The core material does not initiate the induction. =

-- JZ

At 10:22 AM 11/2/2006, you wrote:

This is true, John.

Is the "missing key" to this problem - the iron rods in the =
jumping
ring solenoid? These rods (like the layered metal in the =
transformers)
cause the load to be inductive (and therefore increase
the resistance).
Santos

> I believe these act more like inductive loads.
> John
> ----- Original Message -----
> From: Krishna Chowdary
> To: tap-l@lists.ncsu.edu
> Sent: Wednesday, November 01, 2006 10:27 PM
> Subject: [tap-l] jumping rings "launcher" and =
>
>
> Tappers:
>
> I'm missing something obvious, I think.
>
> In the plans I've seen for homemade jumping rings, I =
see nice
mounts
> that are essentially air core solenoids. I think that they =
are
intended
> to be plugged into a wall outlet. Why don't they blow a fuse =
when
> switched on? Aren't they just essentially short =
circuits?
What's the
>
> (when I was a kid, I wrapped many yards of wire around =
a
can. I spliced
> into a plug. My friend Wes plugged the plug into a wall =
outlet in my
> basement. Luckily I still have my friend Wes. But what =
a
disaster!).
>
>
> --
> regards
> -Krishna
>
> Krishna Chowdary
> Department of Physics & Astronomy
> Bucknell University

Gerald
Zani =
; &nb=
sp; e-mail:
Gerald_Zani@brown.edu
Manager of
Demonstrations ph=
one:
(401) 863-3964
Department of
Physics &n=
bsp; FAX:
(401) 863-2024
Brown
University =
Providence=
,
RI 02912-1843 USA

http://www.physics.brown.edu/physics/demopages/demo/=

http://www.physics.brown.edu/physics/userpages/staff/Ger=
ald_Zani/index.html

Do a little more of that work which you have confessed to be
good,
Which you feel that society and your most Just Judge rightly demand
of you.
Cultivate the tree which you have found to bear fruit in your
soil.
If you have any experiments you would like to try, try them.=20