inductor measurement

[lerameur]

Hi,

I would like to know if there is a relationship other then between cm
and henries in an inductor:
Here is a link where a tesla coil is made and measurements are made in
cm and converted in Henries. Any can illuminate me on this ?
First example on top of this link
http://www.bibliotecapleyades.net/tesla/coloradonotes/coloradonotes10.htm

Have a great day

K

 

[Greg Neill]

George Herold wrote:

On Apr 21, 8:27 am, lerameur <leram...@yahoo.com> wrote:
Hi,

I would like to know if there is a relationship other then between cm
and henries in an inductor:
Here is a link where a tesla coil is made and measurements are made in
cm and converted in Henries. Any can illuminate me on this ?
First example on top of this
linkhttp://www.bibliotecapleyades.net/tesla/coloradonotes/coloradonotes10...

Have a great day

K

My guess is that it's just a units thing. In the MKS system
inductance is in Heneries. In the cgs system the units are all weird,
and it may be that inductance has 'units' of centimeters... I seem to
recall that capacitance has units of inverse centimeters in cgs
units.... I haven't touched cgs units since doing JD Jackson back in
the dark ages. You might try googling inductance and units
conversion.

George H.

In Gaussian units (as well as ESU and EMU) capacitance
has units of cm, resistance has units of s/cm, and
inductance s^2/cm . See, for example,

http://en.wikipedia.org/wiki/Centimetre_gram_second_system_of_units

It's not clear to me just what the author of that document
(supposedly Tesla?) had in mind when he used units of cm for
both capacitance and inductance. I note that he also
specifies Farads and Henries and the conversions to cm seem
to require only a shift of the decimal place. Very odd.

I also note that he was somewhat cavalier with his
significant figures in the results; he's given measured
values to a single digit and a result to seven, and this
is after several roundings at intermediate steps.

 

[George Herold]

On Apr 21, 8:27 am, lerameur <leram...@yahoo.com> wrote:

Hi,

I would like to know if there is a relationship other then between cm
and henries in an inductor:
Here is a link where a tesla coil is made and measurements are made in
cm and converted in Henries. Any can illuminate me on this ?
First example on top of this linkhttp://www.bibliotecapleyades.net/tesla/coloradonotes/coloradonotes10...

Have a great day

K

My guess is that it's just a units thing. In the MKS system
inductance is in Heneries. In the cgs system the units are all weird,
and it may be that inductance has 'units' of centimeters... I seem to
recall that capacitance has units of inverse centimeters in cgs
units.... I haven't touched cgs units since doing JD Jackson back in
the dark ages. You might try googling inductance and units
conversion.

George H.

 

[George Herold]

On Apr 21, 11:36 am, "Greg Neill" <gneil...@MOVEsympatico.ca> wrote:

George Herold wrote:
On Apr 21, 8:27 am, lerameur <leram...@yahoo.com> wrote:
Hi,

I would like to know if there is a relationship other then between cm
and henries in an inductor:
Here is a link where a tesla coil is made and measurements are made in
cm and converted in Henries. Any can illuminate me on this ?
First example on top of this

linkhttp://www.bibliotecapleyades.net/tesla/coloradonotes/coloradonotes10....



Have a great day

K

My guess is that it's just a units thing.  In the MKS system
inductance is in Heneries.  In the cgs system the units are all weird,
and it may be that inductance has 'units' of centimeters... I seem to
recall that capacitance has units of inverse centimeters in cgs
units.... I haven't touched cgs units since doing JD Jackson back in
the dark ages.  You might try googling inductance and units
conversion.

George H.

In Gaussian units (as well as ESU and EMU) capacitance
has units of cm, resistance has units of s/cm, and
inductance s^2/cm .  See, for example,

http://en.wikipedia.org/wiki/Centimetre_gram_second_system_of_units

It's not clear to me just what the author of that document
(supposedly Tesla?) had in mind when he used units of cm for
both capacitance and inductance.  I note that he also
specifies Farads and Henries and the conversions to cm seem
to require only a shift of the decimal place.  Very odd.

I also note that he was somewhat cavalier with his
significant figures in the results; he's given measured
values to a single digit and a result to seven, and this
is after several roundings at intermediate steps.

Ahh, Thanks Greg... my mistake. (no matter what LC should have units
of inverse seconds squared.) So the author of the document (Tesla,
really?) has screwed up the units?

To the OP, There are lots of Tesla websites out there you could try
asking at one of those.

George H.

 

[baron]

George Herold Inscribed thus:

On Apr 21, 8:27 am, lerameur <leram...@yahoo.com> wrote:
Hi,

I would like to know if there is a relationship other then between cm
and henries in an inductor:
Here is a link where a tesla coil is made and measurements are made
in cm and converted in Henries. Any can illuminate me on this ?
First example on top of this

linkhttp://www.bibliotecapleyades.net/tesla/coloradonotes/coloradonotes10...

Have a great day

K

My guess is that it's just a units thing. In the MKS system
inductance is in Heneries. In the cgs system the units are all weird,
and it may be that inductance has 'units' of centimeters... I seem to
recall that capacitance has units of inverse centimeters in cgs
units.... I haven't touched cgs units since doing JD Jackson back in
the dark ages. You might try googling inductance and units
conversion.

George H.

I would be vary wary of anybody using "Champagne Bottles"...

--
Best Regards:
Baron.

 

[Bob Eld]

"lerameur" <lerameur@yahoo.com> wrote in message
news:ac59d2fa-b968-4360-8268-c781a762e48b@i40g2000yqd.googlegroups.com...

Hi,

I would like to know if there is a relationship other then between cm
and henries in an inductor:
Here is a link where a tesla coil is made and measurements are made in
cm and converted in Henries. Any can illuminate me on this ?
First example on top of this link
http://www.bibliotecapleyades.net/tesla/coloradonotes/coloradonotes10.htm

Have a great day

K

Yes there is a relationship. cm or centimeter was used at one time for the
electromagnetic cgs unit of inductance. This is also known as an abhenery. 1
abhenery (cm) = 10^-9 henrys.

You can see this relation in their numbers: 0.00955 = 9,550,000 * 10^-9
Nine millihenrys = 9 million abhenrys or cm.

The rationalized MKS system (SI) has done away with abhenrys, abvolts,
stathenrys, statfarad and other confusing nonsense of the cgs system. See,
the metric system isn't as simple as you thought.