Talk:Ohm

message: I edited the mho reference to state that mho is used in addition to the SI unit of Siemens.  Mho has not fallen out of use in all fields, especially electrical engineering.  Nicholas SL Smithchatter 02:38, 19 October 2009 (UTC)
thread_title:  ''Siemens'' and ''Mho'' as reciprocals to resistance 

message: Shouldn't R = V/I be in it somewhere? In that simple form.
=== Ohm’s law ===
What about Ohm's law should that be mentioned?  —Preceding unsigned comment added by 90.207.22.59 (talk) 16:32, 8 November 2008 (UTC)
thread_title:  Formula 

message: What about Ohm's law should that be mentioned?  —Preceding unsigned comment added by 90.207.22.59 (talk) 16:32, 8 November 2008 (UTC)
thread_title:  Ohm’s law 

message: Start with . The British Association report is on the Internet Archive, though probably too primary a source to be a good reference here. Talk about origins of the unit - starting with telegraphers, various empirical standards, the CGS "absolute" units, magnetic vs. electrostatic units, metrology, practical realizable standards, artifact standards, 20th century redefinitions, then the modern definition. Talk about the struggle to make E=IR and P=IV true by consistent definitions of volt, ohm, amp, and watt. --Wtshymanski (talk) 17:29, 29 January 2009 (UTC)
thread_title: Where's the HISTORY? 

message: From a physics point of view I would strongly suggest to add "\Omega = \frac{Js}{C^2}" to the first equation, since in this way it becomes obvious that the resistance quantum \sim \hbar/e^2 has the same units, see Conductance_quantum.  —Preceding unsigned comment added by 129.187.160.240 (talk) 13:43, 22 April 2010 (UTC)
thread_title:  Physics 

message: using P=I^2 * R, it seems that the Ohm should have units of ...s^-1, not ...s^-3. since [P]=J/s and [I]^2 = C^2/s, then [R] = [P]/[I]^2 = (J/s)/(C^2/s^2) = J*s/C^2 = kg*m^2/(C*s)
129.93.4.35 (talk) 22:38, 13 May 2014 (UTC)
thread_title: Units error?

message: I'm now in a short, vocational course of electronics, and in that class,  many circuit diagrams using ϵ and E for Ohm. But this was very surprising , because in Wikipedia, and any textbooks I could-not found this use, and its basis.
But I found mention in several Websites such as https://www.quora.com/What-does-1E-2E2-220E-4E7-470E-4K7-2K2-2M2-6K8-8K2-means-in-a-mixed-pack-of-resistor  ,    http://www.edaboard.com/thread67699.html    ,  http://learn.mikroe.com/ebooks/componentsofelectronicdevices/chapter/introduction-to-resistors/ ,  ( The last-one also  tells  R is also used). The first-one website also tells 4E7 = 4.7 Ohm. (That also confuses me, because we often write 4E7 = 4 X 10 ^7 ). But these websites do-not clearly mention the origin of these conventions, and do-not cite reference.
So, to improve the article, please provide further information about Symbols for Ohm, other-than capital-letter-Omega (Ω), their origins, uses etc.
Thanks.
RIT RAJARSHI (talk) 12:24, 7 April 2016 (UTC)
replies: text: According to one of your links , this notation was used by the Yugoslav former electronics company Iskra and it stands for enot, meaning unit, and presumably is a Serbo-Croatian word.  Thus, it is both rare in the English speaking world, and does not really mean Ohm.  In principle, it could be used to mark components other than resistors.  This article is not really a suitable place to discuss component marking.  It is certainly not a marking system likely to be found on modern surface mount components.  Those markings are discussed at Surface-mount technology#Identification. SpinningSpark 18:00, 7 April 2016 (UTC)
replies: text: I agree with Spark.  There is mention of this coding on the Resistor page, but manufacturers use symbols as they see fit, regardless of standardized units.--E8 (talk) 19:22, 7 April 2016 (UTC)
thread_title:  Are there Some-other Symbols for Ohm? '''such as <big>ϵ , E</big>, etc'''?  

message: Substituted at 01:45, 30 April 2016 (UTC)
thread_title: Assessment comment

message: Can't we have the proper (or most common) forms listed in the article, especially as "kilohm" and "megohm" might be some of the few exceptions to the general rules (presuming it is actually "kilohm" and "megohm")?
Article Hertz has it both in the lead (kilohertz, megahertz, gigahertz, and terahertz) and in the sub section SI multiples. 
OK, some of them are mentioned inside a sentence at the end of section Definition. What about a more prominent place (e.g. in the lead or a separate subsection)? 
FYI: The Chicago Manual of Style has in 10.57 (16th edition, 2010):
: "Note that in three cases the final vowel of an SI prefix is omitted: kΩ, kilohm (not kilohm); MΩ, megohm (not megaohm); ha, hectare (not hectoare);"
--Mortense (talk) 07:03, 22 January 2017 (UTC)
thread_title:  "megohm" vs. "megaohm", "kilohm" vs. "kiloohm" 

message: About the statement in the article: "In documents printed before WWII the unit symbol often consisted of the raised lowercase omega (ω), such that 56 Ω was written as 56ω." This can be traced back to William Henry Preece in 1867. 
He used the lowercase ω for ohm, and the capital Ω for megaohm. Ceinturion (talk) 14:22, 26 February 2017 (UTC)
thread_title:  Symbol ω and Ω