Units of 1/Farads and 1/Henries?

J

Joel Kolstad

Guest
Just curious... the untis of the inverse of an Ohm are a Mho (cute). Is
there an equivalent for the inverse of Farads and Henries? I realize that
most of the time you're after the impedance broken into the resistance and
reactance (units: ohms) or the admittance broken into conductance and
susceptance (unit: mhos), but I figure there's a good chance someone named
1/Farads and 1/Henries at some point in time.

---Joel Kolstad
 
On Fri, 29 Oct 2004 21:36:33 -0700, Joel Kolstad wrote:

Just curious... the untis of the inverse of an Ohm are a Mho (cute). Is
there an equivalent for the inverse of Farads and Henries? I realize that
most of the time you're after the impedance broken into the resistance and
reactance (units: ohms) or the admittance broken into conductance and
susceptance (unit: mhos), but I figure there's a good chance someone named
1/Farads and 1/Henries at some point in time.
Click to expand...
What would they mean?

Thanks,
Rich
 
"Joel Kolstad" <JKolstad71HatesSpam@Yahoo.Com> wrote:

Just curious... the untis of the inverse of an Ohm are a Mho (cute).
Click to expand...
No, it is called Siemens. Mho does not exist in the modern world.

http://www.madsci.org/posts/archives/sep99/937791885.Ch.r.html


--
Roger J.
 
"Rich Grise" <rich@example.net> wrote in message
news:pan.2004.10.30.08.51.12.5367@example.net...
What would they mean?
Click to expand...
Nothing physically, just an 'interim' unit if you want to talk about, say,
parallel inductors or series capacitances.

Apparently I'll just stick with F^-1 and H^-1...

---Joel
 
"Roger Johansson" <no-email@home.se> wrote in message
news:Xns9592837BDB9CC86336@130.133.1.4...
No, it is called Siemens. Mho does not exist in the modern world.
Click to expand...
But writing an upside-down Omega is so much fun!

Do you have anything that suggests Mho is actually deprecated rather than
simpler synonymous with Siemens?

---Joel
 
"Joel Kolstad" <JKolstad71HatesSpam@Yahoo.Com> wrote:

Do you have anything that suggests Mho is actually deprecated rather
than simpler synonymous with Siemens?
Click to expand...
The SI system is the international scientific and technical standard in
the modern world. There is no Mho in that system.

We should avoid all older or regional units and use the SI system to
simplify understanding and education in a global perspective.


--
Roger J.
 
"Roger Johansson" <no-email@home.se> wrote in message
news:Xns9592C87C4E21286336@130.133.1.4...
We should avoid all older or regional units and use the SI system to
simplify understanding and education in a global perspective.
Click to expand...
Fair enough...

It is amsuing that the English have switched to SI whereas the US hasn't
yet! ;-)
 
"Joel Kolstad" <JKolstad71HatesSpam@Yahoo.Com> wrote in message
news:2LadncYdiv4SfB7cRVn-gA@comcast.com...
"Roger Johansson" <no-email@home.se> wrote in message
news:Xns9592C87C4E21286336@130.133.1.4...
We should avoid all older or regional units and use the SI system to
simplify understanding and education in a global perspective.

Fair enough...

It is amsuing that the English have switched to SI whereas the US hasn't
yet! ;-)
Click to expand...
An Engineer worth his salt should be able to work in any system presented.
 
"Clarence" <no@No.com> wrote in message
news:v2Tgd.36863$QJ3.15857@newssvr21.news.prodigy.com...
An Engineer worth his salt should be able to work in any system presented.
Click to expand...
True, but statistically speaking there are going to be more mistakes when
engineers have to work in multiple systems. There are good examples out
there of very large dollar systems such as satellites failing due to this
problem.
 
Hi,

Just curious... the untis of the inverse of an Ohm are a Mho (cute). Is
there an equivalent for the inverse of Farads and Henries? I realize that
most of the time you're after the impedance broken into the resistance and
reactance (units: ohms) or the admittance broken into conductance and
susceptance (unit: mhos), but I figure there's a good chance someone named
1/Farads and 1/Henries at some point in time.
Click to expand...

The reciprocal of 'Capacitance' is 'Elastance' which comes
from the similarity to the spring constant. It is measured in
'Darafs' would you believe.

The reciprocal of 'Inductance' is sometimes given as 'Reluctance'
but you have to do a dimensional hand-stand to accept it.


Cheers - Joe
 
"Joel Kolstad" <JKolstad71HatesSpam@Yahoo.Com> wrote in message
news:eek:YednXgj-fW1hx7cRVn-pA@comcast.com...
Just curious... the untis of the inverse of an Ohm are a Mho (cute). Is
there an equivalent for the inverse of Farads and Henries? I realize that
most of the time you're after the impedance broken into the resistance and
reactance (units: ohms) or the admittance broken into conductance and
susceptance (unit: mhos), but I figure there's a good chance someone named
1/Farads and 1/Henries at some point in time.

---Joel Kolstad
Click to expand...
Not that I know of. However, the 1/Ohm, or what was called a "mho" is now
officially called a "Siemen". It is possible that someone, somewhere uses a
Daraf or a Yrneh but why?
Susceptance (-1/2*pi*f*L or 2*pi*f*C) is in Siemens. (mhos If you don't want
to change habits)
--
Don Kelly
dhky@peeshaw.ca
remove the urine to answer
 
"Joel Kolstad" <JKolstad71HatesSpam@Yahoo.Com> wrote in message
news:2LadncYdiv4SfB7cRVn-gA@comcast.com...
"Roger Johansson" <no-email@home.se> wrote in message
news:Xns9592C87C4E21286336@130.133.1.4...
We should avoid all older or regional units and use the SI system to
simplify understanding and education in a global perspective.

Fair enough...

It is amsuing that the English have switched to SI whereas the US hasn't
yet! ;-)

Are your texts all out of date? The Siemen is used in US engineering texts
Click to expand...
and literature.
--
Don Kelly
dhky@peeshaw.ca
remove the urine to answer
 
"Joel Kolstad" <JKolstad71HatesSpam@Yahoo.Com> wrote in message
news:r_adnQPS6O1iLBjcRVn-rQ@comcast.com...
"Don Kelly" <dhky@peeshaw.ca> wrote in message
news:CmZgd.70326$nl.57913@pd7tw3no...
"Joel Kolstad" <JKolstad71HatesSpam@Yahoo.Com> wrote in message
news:2LadncYdiv4SfB7cRVn-gA@comcast.com...
"Roger Johansson" <no-email@home.se> wrote in message
news:Xns9592C87C4E21286336@130.133.1.4...
We should avoid all older or regional units and use the SI system to
simplify understanding and education in a global perspective.

Fair enough...

It is amsuing that the English have switched to SI whereas the US
hasn't
yet! ;-)

Are your texts all out of date? The Siemen is used in US engineering
texts
and literature.

I meant in general... when you go to the store to buy furniture in the
U.S.,
the dimensions are in inches/feet/etc.

On the technical side, if you look at magnetics manufacturers, many of
them
still use slightly non-SI units... it's apparently a slow industry to
change. (I was at a seminar once where the speaker mentioned, "You have
to
realize, they're basically just selling you a bunch of processed dirt..."
:) )

---Joel

Sure and I calculate my gas consumption in miles per gallon- translating
Click to expand...
from liters/100km. even though I have been using metric units for 50 years
and SI since it came into official play. My tape measure still is in inches
and feet and I am in an officially SI country next door north from you.
However, dealing with Gauss instead of Tesla is not a problem- I just
convert and carry on. Lines/sq. inch -oops-what is the bugger factor?
At least we don't play around with abvolts, abamperes or statvolts and
statamperes. :)

--
Don Kelly
dhky@peeshaw.ca
remove the urine to answer
 
"Roger Johansson" <no-email@home.se> wrote in message
news:Xns9592C87C4E21286336@130.133.1.4...
"Joel Kolstad" <JKolstad71HatesSpam@Yahoo.Com> wrote:

Do you have anything that suggests Mho is actually deprecated rather
than simpler synonymous with Siemens?

The SI system is the international scientific and technical standard in
the modern world. There is no Mho in that system.

We should avoid all older or regional units and use the SI system to
simplify understanding and education in a global perspective.


--
Roger J.
Click to expand...
another way to conform our government to the rest of the world
 
"Brian Oakley" <brianoakley@ispwest.com> wrote in message
news:cmh10c0s7a@enews1.newsguy.com...
"Roger Johansson" <no-email@home.se> wrote in message
news:Xns9592C87C4E21286336@130.133.1.4...
"Joel Kolstad" <JKolstad71HatesSpam@Yahoo.Com> wrote:

Do you have anything that suggests Mho is actually deprecated rather
than simpler synonymous with Siemens?

The SI system is the international scientific and technical standard in
the modern world. There is no Mho in that system.

We should avoid all older or regional units and use the SI system to
simplify understanding and education in a global perspective.


--
Roger J.

another way to conform our government to the rest of the world

What has the government to do with it. It makes good sense. Good sense and
Click to expand...
government rarely go together.
--
Don Kelly
dhky@peeshaw.ca
remove the urine to answer
 
"Don Kelly" <dhky@peeshaw.ca> wrote in message
news:CmZgd.70326$nl.57913@pd7tw3no...
"Joel Kolstad" <JKolstad71HatesSpam@Yahoo.Com> wrote in message
news:2LadncYdiv4SfB7cRVn-gA@comcast.com...
"Roger Johansson" <no-email@home.se> wrote in message
news:Xns9592C87C4E21286336@130.133.1.4...
We should avoid all older or regional units and use the SI system to
simplify understanding and education in a global perspective.

Fair enough...

It is amsuing that the English have switched to SI whereas the US hasn't
yet! ;-)

Are your texts all out of date? The Siemen is used in US engineering
texts
and literature.
Click to expand...
I meant in general... when you go to the store to buy furniture in the U.S.,
the dimensions are in inches/feet/etc.

On the technical side, if you look at magnetics manufacturers, many of them
still use slightly non-SI units... it's apparently a slow industry to
change. (I was at a seminar once where the speaker mentioned, "You have to
realize, they're basically just selling you a bunch of processed dirt..."
:) )

---Joel
 
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