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{{About|the theorem in electrical circuits|Norton's theorem for queueing networks|flow-equivalent server method}}
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Known in Europe as the '''Mayer&ndash;Norton theorem''', '''Norton's theorem''' holds, to illustrate in DC [[circuit theory]] terms, that (see image):   
:*Any [[linearity|linear]] [[electrical network]] with [[voltage source|voltage]] and [[current source|current]] sources and only [[resistance (electricity)|resistance]]s can be replaced at terminals A-B by an equivalent current source I<sub>NO</sub> in [[series and parallel circuit|parallel]] connection with an equivalent resistance R<sub>NO</sub>.
:*This equivalent current I<sub>NO</sub> is the current obtained at terminals A-B of the network with terminals A-B [[short circuit]]ed.
:*This equivalent resistance R<sub>NO</sub> is the resistance obtained at terminals A-B of the network with all its voltage sources [[short circuit]]ed and all its current sources [[open circuit]]ed.
 
For AC systems the theorem can be applied to [[Reactive power|reactive]] [[Electrical impedance|impedance]]s as well as resistances.   
 
The '''Norton equivalent''' circuit is  used to represent any network of linear sources and impedances at a given [[frequency]]. 
[[File:Norton equivelant.png|thumb|alt=text|Any [[Black box (systems)|black box]] containing resistances only and voltage and current sources can be replaced by an [[equivalent circuit]] consisting of an equivalent current source in parallel connection with an equivalent resistance.]]
 
Norton's theorem and its dual, [[Thévenin's theorem]], are widely used for circuit analysis simplification and to study circuit's initial-condition and steady-state response.
 
Norton's theorem was independently derived in 1926 by [[Siemens|Siemens & Halske]] researcher [[Hans Ferdinand Mayer]] (1895&ndash;1980) and [[Bell Labs]] engineer [[Edward Lawry Norton]] (1898&ndash;1983).<ref>Mayer</ref><ref>Norton</ref><ref>Johnson (2003b)</ref><ref>Brittain</ref><ref>Dorf</ref>     
 
To find the equivalent,
 
# Find the Norton current ''I''<sub>No</sub>. Calculate the output current, ''I''<sub>AB</sub>, with a [[short circuit]] as the [[External electric load|load]] (meaning 0 resistance between A and B). This is I<sub>No</sub>.
# Find the Norton resistance ''R''<sub>No</sub>. When there are no [[dependent source]]s (all current and voltage sources are independent), there are two methods of determining the Norton impedance ''R''<sub>No</sub>.
::* Calculate the output voltage, ''V''<sub>AB</sub>, when in [[Open-circuit voltage|open circuit]] condition (i.e., no load resistor &mdash; meaning infinite load resistance). ''R''<sub>No</sub> equals this V<sub>AB</sub> divided by I<sub>No</sub>.
::or
::* Replace independent voltage sources with short circuits and independent current sources with open circuits. The total resistance across the output port is the Norton impedance ''R''<sub>No</sub>.
 
This is equivalent to calculating the Thevenin resistance.  
:However, when there are dependent sources, the more general method must be used. This method is not shown below in the diagrams.
::* Connect a constant current source at the output terminals of the circuit with a value of 1 Ampere and calculate the voltage at its terminals.  This voltage divided by the 1 A current is the Norton impedance ''R''<sub>No</sub>. This method must be used if the circuit contains dependent sources, but it can be used in all cases even when there are no dependent sources.
 
==Example of a Norton equivalent circuit==
{|
|-
|[[Image:Thevenin and norton step 1.png|framed|Step 0: The original circuit]] || [[Image:Norton step 2.png|framed|Step 1: Calculating the equivalent output current]] || [[Image:Thevenin and norton step 3.png|framed|Step 2: Calculating the equivalent resistance]]
|}
[[Image:Norton step 4.png|framed|right|Step 3: The equivalent circuit]]
 
In the example, the total current ''I''<sub>total</sub> is  given by:
 
:<math>
I_\mathrm{total} = {15 \mathrm{V} \over 2\,\mathrm{k}\Omega + (1\,\mathrm{k}\Omega \| (1\,\mathrm{k}\Omega + 1\,\mathrm{k}\Omega))} = 5.625 \mathrm{mA}.
</math>
 
The current through the load is then, using the [[current divider rule]]:
 
:<math>
I_\mathrm{No} = {1\,\mathrm{k}\Omega + 1\,\mathrm{k}\Omega \over (1\,\mathrm{k}\Omega + 1\,\mathrm{k}\Omega + 1\,\mathrm{k}\Omega)} \cdot I_\mathrm{total}
</math>
:<math>
= 2/3 \cdot 5.625 \mathrm{mA} = 3.75 \mathrm{mA}.
</math>
 
And the equivalent resistance looking back into the circuit is:
 
:<math>
R_\mathrm{eq} = 1\,\mathrm{k}\Omega + (2\,\mathrm{k}\Omega \| (1\,\mathrm{k}\Omega + 1\,\mathrm{k}\Omega)) = 2\,\mathrm{k}\Omega.
</math>
 
So the equivalent circuit is a 3.70 mA current source in parallel with a 2 kΩ resistor.
 
==Conversion to a Thévenin equivalent==
[[Image:Thevenin to Norton2.PNG|right]]
 
A Norton equivalent circuit is related to the [[Thévenin theorem|Thévenin equivalent]] by the following equations:
:<math>R_{Th} = R_{No} \!</math>
 
:<math>V_{Th} = I_{No} R_{No} \!</math>
 
:<math>\frac{V_{Th}}{R_{Th}} = I_{No}\!</math>
 
==Queueing theory==
The passive circuit equivalent of "Norton's theorem" in [[queuing theory]] is called the Chandy Herzog Woo theorem.<ref>Johnson (2003a)</ref><ref>Gunther</ref> In a [[reversible queueing system]], it is often possible to replace an uninteresting subset of queues by a single ([[FCFS]] or [[Processor sharing|PS]]) queue with an appropriately chosen service rate.<ref>Chandy et al.</ref>
 
== See also ==
*[[Millman's theorem]]
*[[Source transformation]]
*[[Superposition theorem]]
*[[Thévenin's theorem]]
*[[Maximum power transfer theorem]]
*[[Extra element theorem]]
==References==
{{reflist}}
==Bibliography==
*{{cite journal|last=Brittain|first=J.E.|title=Thevenin's theorem|journal=IEEE Spectrum|date=March 1990|volume=27|issue=3|page=42|doi=10.1109/6.48845|url=http://ieeexplore.ieee.org/search/searchresult.jsp?newsearch=true&queryText=James+E.+Brittain+Thevenin%27s+theorem&.x=41&.y=17|accessdate=1 February 2013}}
*{{cite journal|last=Chandy|first=K. M.|coauthors=Herzog, U.; Woo, L.|title=Parametric Analysis of Queuing Networks|journal=IBM Journal of Research and Development|date=Jan 1975|volume=19|issue=1|pages=36–42|doi=10.1147/rd.191.0036|url=http://scholar.google.ca/scholar_url?hl=en&q=http://citeseerx.ist.psu.edu/viewdoc/download%3Fdoi%3D10.1.1.93.9312%26rep%3Drep1%26type%3Dpdf&sa=X&scisig=AAGBfm1HEBU-rSFYLTIePQWPitczchOopA&oi=scholarr&ei=L3wQUfP9DOHWiwKYtICQAQ&ved=0CC4QgAMoADAA}}
*{{cite conference|last=Dorf|first=Richard C.|coauthors=Svoboda, James A.|title=Chapter 5 – Circuit Theorems|booktitle=Introduction to Electric Circuits|year=2010|publisher=John Wiley & Sons|location=Hoboken, NJ|isbn=978-0-470-52157-1|url=http://ca.wiley.com/WileyCDA/WileyTitle/productCd-EHEP000347.html|edition=8th|pages=162-207}}
*{{cite book|last=Gunther|first=N.J.|title=Analyzing computer systems performance : with PERL::PDQ|year=2004|publisher=Springer|location=Berlin|isbn=3-540-20865-8|page=281|edition=Online-Ausg.|url=http://books.google.com/?id=rp1EZKnr48kC&pg=PA83#v=onepage&q&f=false}}
*{{cite journal|last=Johnson|first=D.H.|title=Origins of the equivalent circuit concept: the voltage-source equivalent|journal=Proceedings of the IEEE|year=2003|volume=91|issue=4|pages=636–640|doi=10.1109/JPROC.2003.811716|url=http://www.ece.rice.edu/~dhj/paper1.pdf}}
*{{cite journal|last=Johnson|first=D.H.|title=Origins of the equivalent circuit concept: the current-source equivalent|journal=Proceedings of the IEEE|year=2003|volume=91|issue=5|pages=817–821|doi=10.1109/JPROC.2003.811795|url=http://www.ece.rice.edu/~dhj/paper2.pdf}}
*{{cite journal|last=Mayer|first=H. F.|title=Ueber das Ersatzschema der Verstärkerröhre (On equivalent circuits for electronic amplifiers]|journal=Telegraphen- und Fernsprech-Technik|year=1926|volume=15|pages=335–337}}
*{{cite journal|last=Norton|first=E. L.|title=Technical Report TM26–0–1860 – Design of finite networks for uniform frequency characteristic|year=1926|publisher=Bell Laboratories}}
 
== External links ==
* [http://www.allaboutcircuits.com/vol_1/chpt_10/9.html Norton's theorem at allaboutcircuits.com]
 
[[Category:Circuit theorems]]

Latest revision as of 18:14, 12 February 2014

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