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[[Image:Inductor.jpg|thumb|150px|An [[inductor]] composed of a [[wire]] wound around a [[magnetic core]]  used to confine and guide the induced [[magnetic field]].]]
This is a preview for the new '''MathML rendering mode''' (with SVG fallback), which is availble in production for registered users.


In [[physics]], and [[electronics]], the '''henry''' (symbol '''H''') is the [[SI derived unit]] of [[inductance]].<ref>{{cite web | title=How Many? A Dictionary of Units of Measurement | last=Rowlett | first = Russ | url = http://www.unc.edu/~rowlett/units/dictH.html | publisher = [[University of North Carolina at Chapel Hill]]}}</ref> It is named after [[Joseph Henry]] (1797–1878), the American scientist who discovered electromagnetic induction independently of and at about the same time as [[Michael Faraday]] (1791–1867) in England.<ref>{{cite web | title = A Princeton Companion | url = http://etcweb.princeton.edu/CampusWWW/Companion/henry_joseph.html | author = Herbert S. Bailey, Jr.}}</ref> The [[magnetic permeability]] of a vacuum is 4π×10<sup>−7</sup> H/m (henry per meter).
If you would like use the '''MathML''' rendering mode, you need a wikipedia user account that can be registered here [[https://en.wikipedia.org/wiki/Special:UserLogin/signup]]
* Only registered users will be able to execute this rendering mode.
* Note: you need not enter a email address (nor any other private information). Please do not use a password that you use elsewhere.


The [[National Institute of Standards and Technology]] provides guidance for American users of SI to write the plural as henries.<ref name=Taylor>{{Cite journal|author=Ambler Thompson & Barry N. Taylor|year=2008|url=http://physics.nist.gov/cuu/pdf/sp811.pdf|title=NIST Special Publication 811: Guide for the Use of the International System of Units (SI)|publisher=National Institute of Standards and Technology|accessdate=2013-03-21}}
Registered users will be able to choose between the following three rendering modes:  
</ref>{{rp|31}}


== Definition ==
'''MathML'''
If the rate of change of [[Current (electricity)|current]] in a circuit is one [[ampere]] per [[second]] and the resulting [[electromotive force]] is one [[volt]], then the [[inductance]] of the circuit is one henry. Other equivalent combinations of SI units are as follows:<ref>{{cite web | title = Essentials of the SI: Base & derived units | work = The NIST Reference on Constants, Units and Uncertainty | url = http://physics.nist.gov/cuu/Units/units.html | publisher = [[National Institute of Standards and Technology]]}}</ref>
:<math forcemathmode="mathml">E=mc^2</math>


:<math>\mbox{H}
<!--'''PNG'''  (currently default in production)
= \dfrac{\mbox{m}^2 \cdot \mbox{kg}}{\mbox{C}^2}
:<math forcemathmode="png">E=mc^2</math>
= \dfrac{\mbox{m}^2 \cdot \mbox{kg}}{\mbox{s}^{2} \cdot \mbox{A}^2}
= \dfrac{\mbox{J}}{\mbox{A}^2}
= \dfrac{\mbox{Wb}}{\mbox{A}}
= \dfrac{\mbox{V} \cdot \mbox{s}}{\mbox{A}}
= \dfrac{\mbox{s}^2}{\mbox{F}}
= \Omega \cdot \mbox{s}
</math>


where
'''source'''
:<math forcemathmode="source">E=mc^2</math> -->


A = [[ampere]],
<span style="color: red">Follow this [https://en.wikipedia.org/wiki/Special:Preferences#mw-prefsection-rendering link] to change your Math rendering settings.</span> You can also add a [https://en.wikipedia.org/wiki/Special:Preferences#mw-prefsection-rendering-skin Custom CSS] to force the MathML/SVG rendering or select different font families. See [https://www.mediawiki.org/wiki/Extension:Math#CSS_for_the_MathML_with_SVG_fallback_mode these examples].
<br>C = [[coulomb]],
<br>F = [[farad]],
<br>J = [[joule]],
<br>kg = [[kilogram]],
<br>m = [[meter]],
<br>s = [[second]],
<br>Wb = [[Weber (unit)|weber]],
<br>V = [[volt]],
<br>Ω = [[ohm]].


== Notes and references ==
==Demos==
{{Reflist|2}}


== See also ==
Here are some [https://commons.wikimedia.org/w/index.php?title=Special:ListFiles/Frederic.wang demos]:
* [[Electrical impedance|Impedance]]
* [[Inductor]]
* [[Weber (unit)]]




{{SI units}}
* accessibility:
** Safari + VoiceOver: [https://commons.wikimedia.org/wiki/File:VoiceOver-Mac-Safari.ogv video only], [[File:Voiceover-mathml-example-1.wav|thumb|Voiceover-mathml-example-1]], [[File:Voiceover-mathml-example-2.wav|thumb|Voiceover-mathml-example-2]], [[File:Voiceover-mathml-example-3.wav|thumb|Voiceover-mathml-example-3]], [[File:Voiceover-mathml-example-4.wav|thumb|Voiceover-mathml-example-4]], [[File:Voiceover-mathml-example-5.wav|thumb|Voiceover-mathml-example-5]], [[File:Voiceover-mathml-example-6.wav|thumb|Voiceover-mathml-example-6]], [[File:Voiceover-mathml-example-7.wav|thumb|Voiceover-mathml-example-7]]
** [https://commons.wikimedia.org/wiki/File:MathPlayer-Audio-Windows7-InternetExplorer.ogg Internet Explorer + MathPlayer (audio)]
** [https://commons.wikimedia.org/wiki/File:MathPlayer-SynchronizedHighlighting-WIndows7-InternetExplorer.png Internet Explorer + MathPlayer (synchronized highlighting)]
** [https://commons.wikimedia.org/wiki/File:MathPlayer-Braille-Windows7-InternetExplorer.png Internet Explorer + MathPlayer (braille)]
** NVDA+MathPlayer: [[File:Nvda-mathml-example-1.wav|thumb|Nvda-mathml-example-1]], [[File:Nvda-mathml-example-2.wav|thumb|Nvda-mathml-example-2]], [[File:Nvda-mathml-example-3.wav|thumb|Nvda-mathml-example-3]], [[File:Nvda-mathml-example-4.wav|thumb|Nvda-mathml-example-4]], [[File:Nvda-mathml-example-5.wav|thumb|Nvda-mathml-example-5]], [[File:Nvda-mathml-example-6.wav|thumb|Nvda-mathml-example-6]], [[File:Nvda-mathml-example-7.wav|thumb|Nvda-mathml-example-7]].
** Orca: There is ongoing work, but no support at all at the moment [[File:Orca-mathml-example-1.wav|thumb|Orca-mathml-example-1]], [[File:Orca-mathml-example-2.wav|thumb|Orca-mathml-example-2]], [[File:Orca-mathml-example-3.wav|thumb|Orca-mathml-example-3]], [[File:Orca-mathml-example-4.wav|thumb|Orca-mathml-example-4]], [[File:Orca-mathml-example-5.wav|thumb|Orca-mathml-example-5]], [[File:Orca-mathml-example-6.wav|thumb|Orca-mathml-example-6]], [[File:Orca-mathml-example-7.wav|thumb|Orca-mathml-example-7]].
** From our testing, ChromeVox and JAWS are not able to read the formulas generated by the MathML mode.


[[Category:SI derived units]]
==Test pages ==
[[Category:Units of electrical inductance]]
 
To test the '''MathML''', '''PNG''', and '''source''' rendering modes, please go to one of the following test pages:
*[[Displaystyle]]
*[[MathAxisAlignment]]
*[[Styling]]
*[[Linebreaking]]
*[[Unique Ids]]
*[[Help:Formula]]
 
*[[Inputtypes|Inputtypes (private Wikis only)]]
*[[Url2Image|Url2Image (private Wikis only)]]
==Bug reporting==
If you find any bugs, please report them at [https://bugzilla.wikimedia.org/enter_bug.cgi?product=MediaWiki%20extensions&component=Math&version=master&short_desc=Math-preview%20rendering%20problem Bugzilla], or write an email to math_bugs (at) ckurs (dot) de .

Latest revision as of 22:52, 15 September 2019

This is a preview for the new MathML rendering mode (with SVG fallback), which is availble in production for registered users.

If you would like use the MathML rendering mode, you need a wikipedia user account that can be registered here [[1]]

  • Only registered users will be able to execute this rendering mode.
  • Note: you need not enter a email address (nor any other private information). Please do not use a password that you use elsewhere.

Registered users will be able to choose between the following three rendering modes:

MathML

E=mc2


Follow this link to change your Math rendering settings. You can also add a Custom CSS to force the MathML/SVG rendering or select different font families. See these examples.

Demos

Here are some demos:


Test pages

To test the MathML, PNG, and source rendering modes, please go to one of the following test pages:

Bug reporting

If you find any bugs, please report them at Bugzilla, or write an email to math_bugs (at) ckurs (dot) de .

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