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English national identity
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Main article: English people § Historical origins and identity
A national identity of the English as the people or ethnic group native to England developed in the Middle Ages arguably beginning with the unification of the Kingdom of England in the 10th century, but explicitly in the 11th century after the Norman Conquest, when Englishry came to be the status of the subject indigenous population.
From the eighteenth century the terms 'English' and 'British' began to be seen as interchangeable to many of the English.[1]
While the official United Kingdom census does record ethnicity, English/Welsh/Scottish/Northern Irish/British is a single tick-box under the "White" heading for the answer to the ethnicity question asked in England and Wales (while making the distinction of white Irish).[2]
Although Englishness and Britishness are used synonymously in some contexts,[3] the two terms are not identical and the relation of each to the other is complex. Englishness is often a response to different national identities within Britain such as Scottishness, Irishness, Welshness.[4]
Sometimes Englishness is thought to be encapsulated in terms of a particular relation to sport: "fair play," for instance. Arguably, England's "national games" are football and, particularly, cricket. As cricket historian Dominic Malcolm argues, the link between cricket and England's national identity became solidified through literature. Works such as James Love's "Cricket: an heroic poem" and Mary Mitford's "our Village," along with Nyren's "cricketers of my Time" and Pycroft's "The Cricket Field," purported to identify the characteristics of cricket with the notional characteristics of English society, such as pragmatism, integrity, and independence.[5]
Contents
[hide]
1 See also
2 References
3 Further reading
4 External links
See also[edit]
Culture of England
English nationalism
English independence
Social history of England
St George's Day in England
National identity
Scottish national identity
Welsh nationalism
References[edit]
Jump up ^ Smith, Anthony (13 May 2005). "'Set in the Silver Sea': English National Identity and European Integration" (PDF). Workshop: National Identity and Euroscepticism: A Comparison Between France and the United Kingdom. University of Oxford. Retrieved 10 February 2011.
Jump up ^ "Ethnic group". Office for National Statistics. Retrieved 11 May 2015.
Jump up ^ "South East Wales Public Life - Dr Gwynfor Evans". BBC. Retrieved 2010-04-13.
Jump up ^ MacPhee, Graham and Prem Poddar, eds. (2010). Empire and After: Englishness in Postcolonial Perspective. New York: Berghahn Books. pp. 1–25. ISBN 978-1-84545-320-6. CS1 maint: Uses editors parameter (link)
Jump up ^ Malcolm, Dominic (2012). Globalizing Cricket: Englishness, Empire and Identity. London: Bloomsbury. p. 34. ISBN 9781849665612.
Further reading[edit]
Breward, Christopher; Conekin, Conekin; Cox, Caroline (2002). The Englishness of English dress. Berg Publishers. ISBN 978-1-85973-528-2.
Siobhain Bly, Calkin (2009). Saracens and the Making of English Identity: The Auchinleck Manuscript. Taylor and Francis. ISBN 978-0-415-80309-0.
Colls, Robert (1987). Englishness: politics and culture 1880-1920. Routledge. ISBN 978-0-7099-4562-8.
Featherstone, Simon (2009). Englishness: twentieth century popular culture and the forming of English identity. Edinburgh University Press. ISBN 978-0-7486-2365-5.
Harris, Stephen J. (2003). Race and Ethnicity in Anglo-Saxon Literature. Taylor & Francis.
Helmreich, Anne (2002). The English garden and national identity. Modern architecture and cultural identity. Cambridge University Press. ISBN 978-0-521-59293-2.
Langford, Paul (2001). Englishness identified: manners and character, 1650-1850. Oxford University Press. ISBN 978-0-19-924640-3.
Rogers, David; McLeod, John (2004). The revision of Englishness. Manchester University Press. ISBN 978-0-7190-6972-7.
Spiering, Menno (1992). Englishness: foreigners and images of national identity in postwar literature. Rodopi. ISBN 978-90-5183-436-9.
MacPhee, Graham; Prem Poddar (2010). MacPhee,Graham and Prem Poddar, ed. Empire and After: Englishness in Postcolonial Perspective. New York: Berghahn Books. pp. 1–25. ISBN 978-1-84545-320-6. CS1 maint: Uses authors parameter (link)
External links[edit]
Clarkson, Jeremy (25 November 2007). "We've been robbed of our Englishness". Sunday Times. Retrieved 10 February 2011.
Glass, Bryan S (24 March 2005). "English Identity in the Wake of Devolution". Southwestern Political Science Association. Retrieved 10 February 2011.
Glass, Bryan S (7 April 2005). "The Devolution Gamble: State, Nation, and Identity in England". The Midwest Political Science Association. Retrieved 10 February 2011.
Hill, Amelia (13 June 2004). "The English identity crisis: who do you think you are?". The Observer. Retrieved 10 February 2011.
Kenny, Michael (11 February 2010). "Englishness: the forbidden identity". The Guardian. Retrieved 10 February 2011.
Kumar, Krishan (2003). The making of English national identity (PDF). Cambridge cultural social studies. Cambridge University Press. ISBN 978-0-521-77736-0.
Younge, Gary (28 June 2010). "England's identity crisis". The Guardian. Retrieved 10 February 2011.
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text:
Series and parallel circuits
From Wikipedia, the free encyclopedia
Jump to: navigation, search
A series circuit with a voltage source (such as a battery, or in this case a cell) and 3 resistors
Components of an electrical circuit or electronic circuit can be connected in many different ways. The two simplest of these are called series and parallel and occur frequently. Components connected in series are connected along a single path, so the same current flows through all of the components.[1][2] Components connected in parallel are connected along multiple paths, so the same voltage is applied to each component.[3]
A circuit composed solely of components connected in series is known as a series circuit; likewise, one connected completely in parallel is known as a parallel circuit.
In a series circuit, the current through each of the components is the same, and the voltage across the circuit is the sum of the voltages across each component.[1] In a parallel circuit, the voltage across each of the components is the same, and the total current is the sum of the currents through each component.[1]
Consider a very simple circuit consisting of four light bulbs and one 6 V battery. If a wire joins the battery to one bulb, to the next bulb, to the next bulb, to the next bulb, then back to the battery, in one continuous loop, the bulbs are said to be in series. If each bulb is wired to the battery in a separate loop, the bulbs are said to be in parallel. If the four light bulbs are connected in series, there is same current through all of them, and the voltage drop is 1.5 V across each bulb, which may not be sufficient to make them glow. If the light bulbs are connected in parallel, the currents through the light bulbs combine to form the current in the battery, while the voltage drop is across each bulb and they all glow.
In a series circuit, every device must function for the circuit to be complete. One bulb burning out in a series circuit breaks the circuit. In parallel circuits, each light bulb has its own circuit, so all but one light could be burned out, and the last one will still function.
Contents
[hide]
1 Series circuits
1.1 Current
1.2 Resistors
1.3 Inductors
1.4 Capacitors
1.5 Switches
1.6 Cells and batteries
1.7 Voltage
2 Parallel circuits
2.1 Voltage
2.2 Current
2.3 Resistors
2.4 Inductors
2.5 Capacitors
2.6 Switches
2.7 Cells and batteries
3 Combining conductances
4 Notation
5 Applications
6 See also
7 Notes
8 References
9 External links
Series circuits[edit]
Part of a series of articles about
Electromagnetism
Electricity
Magnetism
Electrostatics[show]
Electric charge
Static electricity
Electric field
Conductor
Insulator
Triboelectricity
Electrostatic discharge
Induction
Coulomb's law
Gauss's law
Electric flux / potential energy
Electric dipole moment
Polarization density
Magnetostatics[show]
Ampère's law
Magnetic field
Magnetization
Magnetic flux
Biot–Savart law
Magnetic dipole moment
Gauss's law for magnetism
Electrodynamics[show]
Lorentz force law
Electromagnetic induction
Faraday's law
Lenz's law
Displacement current
Magnetic potential
Maxwell's equations
Electromagnetic field
Electromagnetic pulse
Electromagnetic radiation
Maxwell tensor
Poynting vector
Liénard–Wiechert potential
Jefimenko's equations
Eddy current
London equations
Mathematical descriptions of the electromagnetic field
Electrical network[hide]
Electric current
Electric potential
Voltage
Resistance
Ohm's law
Series circuit
Parallel circuit
Direct current
Alternating current
Electromotive force
Capacitance
Inductance
Impedance
Resonant cavities
Waveguides
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(stress–energy tensor)
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Scientists[show]
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Series circuits are sometimes called current-coupled or daisy chain-coupled. The current in a series circuit goes through every component in the circuit. Therefore, all of the components in a series connection carry the same current.
A series circuit's principle characteristic is that it has only one path in which its current can flow. Opening or breaking a series circuit at any point causes the entire circuit to "open" or stop operating. For example, if even one of the light bulbs in an older-style string of Christmas tree lights burns out or is removed, the entire string becomes inoperable until the bulb is replaced.
Current[edit]
I = I 1 = I 2 = I 3 = ⋯ = I n {\displaystyle I=I_{1}=I_{2}=I_{3}=\cdots =I_{n}}
In a series circuit the current is the same for all of the elements.
Resistors[edit]
The total resistance of resistors in series is equal to the sum of their individual resistances:
R total = R 1 + R 2 + ⋯ + R n {\displaystyle R_{\text{total}}=R_{1}+R_{2}+\cdots +R_{n}}
Electrical conductance presents a reciprocal quantity to resistance. Total conductance of a series circuits of pure resistors, therefore, can be calculated from the following expression:
1 G t o t a l = 1 G 1 + 1 G 2 + ⋯ + 1 G n {\displaystyle {\frac {1}{G_{\mathrm {total} }}}={\frac {1}{G_{1}}}+{\frac {1}{G_{2}}}+\cdots +{\frac {1}{G_{n}}}} .
For a special case of two resistors in series, the total conductance is equal to:
G total = G 1 G 2 G 1 + G 2 . {\displaystyle G_{\text{total}}={\frac {G_{1}G_{2}}{G_{1}+G_{2}}}.}
Inductors[edit]
Inductors follow the same law, in that the total inductance of non-coupled inductors in series is equal to the sum of their individual inductances:
L t o t a l = L 1 + L 2 + ⋯ + L n {\displaystyle L_{\mathrm {total} }=L_{1}+L_{2}+\cdots +L_{n}}
However, in some situations it is difficult to prevent adjacent inductors from influencing each other, as the magnetic field of one device couples with the windings of its neighbours. This influence is defined by the mutual inductance M. For example, if two inductors are in series, there are two possible equivalent inductances depending on how the magnetic fields of both inductors influence each other.
When there are more than two inductors, the mutual inductance between each of them and the way the coils influence each other complicates the calculation. For a larger number of coils the total combined inductance is given by the sum of all mutual inductances between the various coils including the mutual inductance of each given coil with itself, which we term self-inductance or simply inductance. For three coils, there are six mutual inductances M 12 {\displaystyle M_{12}} , M 13 {\displaystyle M_{13}} , M 23 {\displaystyle M_{23}} and M 21 {\displaystyle M_{21}} , M 31 {\displaystyle M_{31}} and M 32 {\displaystyle M_{32}} . There are also the three self-inductances of the three coils: M 11 {\displaystyle M_{11}} , M 22 {\displaystyle M_{22}} and M 33 {\displaystyle M_{33}} .
Therefore
L t o t a l = ( M 11 + M 22 + M 33 ) + ( M 12 + M 13 + M 23 ) + ( M 21 + M 31 + M 32 ) {\displaystyle L_{\mathrm {total} }=(M_{11}+M_{22}+M_{33})+(M_{12}+M_{13}+M_{23})+(M_{21}+M_{31}+M_{32})}
By reciprocity M i j {\displaystyle M_{ij}} = M j i {\displaystyle M_{ji}} so that the last two groups can be combined. The first three terms represent the sum of the self-inductances of the various coils. The formula is easily extended to any number of series coils with mutual coupling. The method can be used to find the self-inductance of large coils of wire of any cross-sectional shape by computing the sum of the mutual inductance of each turn of wire in the coil with every other turn since in such a coil all turns are in series.
Capacitors[edit]
See also: Capacitor § Networks
Capacitors follow the same law using the reciprocals. The total capacitance of capacitors in series is equal to the reciprocal of the sum of the reciprocals of their individual capacitances:
1 C t o t a l = 1 C 1 + 1 C 2 + ⋯ + 1 C n {\displaystyle {\frac {1}{C_{\mathrm {total} }}}={\frac {1}{C_{1}}}+{\frac {1}{C_{2}}}+\cdots +{\frac {1}{C_{n}}}} .
Switches[edit]
Two or more switches in series form a logical AND; the circuit only carries current if all switches are closed. See AND gate.
Cells and batteries[edit]
A battery is a collection of electrochemical cells. If the cells are connected in series, the voltage of the battery will be the sum of the cell voltages. For example, a 12 volt car battery contains six 2-volt cells connected in series. Some vehicles, such as trucks, have two 12 volt batteries in series to feed the 24 volt system.
Voltage[edit]
In a series circuit the voltage is addition of all the voltage elements.
V = V 1 + V 2 + ⋯ + V n {\displaystyle V=V_{1}+V_{2}+\dots +V_{n}}
Parallel circuits[edit]
"In Parallel" redirects here. For the 2017 Dhani Harrison album, see In Parallel (album).
If two or more components are connected in parallel they have the same potential difference (voltage) across their ends. The potential differences across the components are the same in magnitude, and they also have identical polarities. The same voltage is applicable to all circuit components connected in parallel. The total current is the sum of the currents through the individual components, in accordance with Kirchhoff’s current law.
Voltage[edit]
In a parallel circuit the voltage is the same for all elements.
V = V 1 = V 2 = … = V n {\displaystyle V=V_{1}=V_{2}=\ldots =V_{n}}
Current[edit]
The current in each individual resistor is found by Ohm's law. Factoring out the voltage gives
I t o t a l = V ( 1 R 1 + 1 R 2 + ⋯ + 1 R n ) {\displaystyle I_{\mathrm {total} }=V\left({\frac {1}{R_{1}}}+{\frac {1}{R_{2}}}+\cdots +{\frac {1}{R_{n}}}\right)} .
Resistors[edit]
To find the total resistance of all components, add the reciprocals of the resistances R i {\displaystyle R_{i}} of each component and take the reciprocal of the sum. Total resistance will always be less than the value of the smallest resistance:
1 R t o t a l = 1 R 1 + 1 R 2 + ⋯ + 1 R n {\displaystyle {\frac {1}{R_{\mathrm {total} }}}={\frac {1}{R_{1}}}+{\frac {1}{R_{2}}}+\cdots +{\frac {1}{R_{n}}}} .
For only two resistors, the unreciprocated expression is reasonably simple:
R t o t a l = R 1 R 2 R 1 + R 2 . {\displaystyle R_{\mathrm {total} }={\frac {R_{1}R_{2}}{R_{1}+R_{2}}}.}
This sometimes goes by the mnemonic product over sum.
For N equal resistors in parallel, the reciprocal sum expression simplifies to:
1 R t o t a l = N 1 R {\displaystyle {\frac {1}{R_{\mathrm {total} }}}=N{\frac {1}{R}}} .
and therefore to:
R t o t a l = R N {\displaystyle R_{\mathrm {total} }={\frac {R}{N}}} .
To find the current in a component with resistance R i {\displaystyle R_{i}} , use Ohm's law again:
I i = V R i {\displaystyle I_{i}={\frac {V}{R_{i}}}\,} .
The components divide the current according to their reciprocal resistances, so, in the case of two resistors,
I 1 I 2 = R 2 R 1 {\displaystyle {\frac {I_{1}}{I_{2}}}={\frac {R_{2}}{R_{1}}}} .
An old term for devices connected in parallel is multiple, such as a multiple connection for arc lamps.
Since electrical conductance G {\displaystyle G} is reciprocal to resistance, the expression for total conductance of a parallel circuit of resistors reads:
G t o t a l = G 1 + G 2 + ⋯ + G n {\displaystyle G_{\mathrm {total} }=G_{1}+G_{2}+\cdots +G_{n}} .
The relations for total conductance and resistance stand in a complementary relationship: the expression for a series connection of resistances is the same as for parallel connection of conductances, and vice versa.
Inductors[edit]
Inductors follow the same law, in that the total inductance of non-coupled inductors in parallel is equal to the reciprocal of the sum of the reciprocals of their individual inductances:
1 L t o t a l = 1 L 1 + 1 L 2 + ⋯ + 1 L n {\displaystyle {\frac {1}{L_{\mathrm {total} }}}={\frac {1}{L_{1}}}+{\frac {1}{L_{2}}}+\cdots +{\frac {1}{L_{n}}}} .
If the inductors are situated in each other's magnetic fields, this approach is invalid due to mutual inductance. If the mutual inductance between two coils in parallel is M, the equivalent inductor is:
1 L t o t a l = L 1 + L 2 − 2 M L 1 L 2 − M 2 {\displaystyle {\frac {1}{L_{\mathrm {total} }}}={\frac {L_{1}+L_{2}-2M}{L_{1}L_{2}-M^{2}}}}
If L 1 = L 2 {\displaystyle L_{1}=L_{2}}
L total = L + M 2 {\displaystyle L_{\text{total}}={\frac {L+M}{2}}}
The sign of M {\displaystyle M} depends on how the magnetic fields influence each other. For two equal tightly coupled coils the total inductance is close to that of each single coil. If the polarity of one coil is reversed so that M is negative, then the parallel inductance is nearly zero or the combination is almost non-inductive. It is assumed in the "tightly coupled" case M is very nearly equal to L. However, if the inductances are not equal and the coils are tightly coupled there can be near short circuit conditions and high circulating currents for both positive and negative values of M, which can cause problems.
More than three inductors becomes more complex and the mutual inductance of each inductor on each other inductor and their influence on each other must be considered. For three coils, there are three mutual inductances M 12 {\displaystyle M_{12}} , M 13 {\displaystyle M_{13}} and M 23 {\displaystyle M_{23}} . This is best handled by matrix methods and summing the terms of the inverse of the L {\displaystyle L} matrix (3 by 3 in this case).
The pertinent equations are of the form: v i = ∑ j L i , j d i j d t {\displaystyle v_{i}=\sum _{j}L_{i,j}{\frac {di_{j}}{dt}}}
Capacitors[edit]
The total capacitance of capacitors in parallel is equal to the sum of their individual capacitances:
C t o t a l = C 1 + C 2 + ⋯ + C n {\displaystyle C_{\mathrm {total} }=C_{1}+C_{2}+\cdots +C_{n}} .
The working voltage of a parallel combination of capacitors is always limited by the smallest working voltage of an individual capacitor.
Switches[edit]
Two or more switches in parallel form a logical OR; the circuit carries current if at least one switch is closed. See OR gate.
Cells and batteries[edit]
If the cells of a battery are connected in parallel, the battery voltage will be the same as the cell voltage, but the current supplied by each cell will be a fraction of the total current. For example, if a battery comprises four identical cells connected in parallel and delivers a current of 1 ampere, the current supplied by each cell will be 0.25 ampere. Parallel-connected batteries were widely used to power the valve filaments in portable radios, but they are now rare. Some solar electric systems have batteries in parallel to increase the storage capacity; a close approximation of total amp-hours is the sum of all amp-hours of in-parallel batteries.
Combining conductances[edit]
From Kirchhoff's circuit laws we can deduce the rules for combining conductances. For two conductances G 1 {\displaystyle G_{1}} and G 2 {\displaystyle G_{2}} in parallel, the voltage across them is the same and from Kirchhoff's current law (KCL) the total current is
I eq = I 1 + I 2 . {\displaystyle I_{\text{eq}}=I_{1}+I_{2}.\ \,}
Substituting Ohm's law for conductances gives
G eq V = G 1 V + G 2 V {\displaystyle G_{\text{eq}}V=G_{1}V+G_{2}V\ \,}
and the equivalent conductance will be,
G eq = G 1 + G 2 . {\displaystyle G_{\text{eq}}=G_{1}+G_{2}.\ \,}
For two conductances G 1 {\displaystyle G_{1}} and G 2 {\displaystyle G_{2}} in series the current through them will be the same and Kirchhoff's Voltage Law tells us that the voltage across them is the sum of the voltages across each conductance, that is,
V eq = V 1 + V 2 . {\displaystyle V_{\text{eq}}=V_{1}+V_{2}.\ \,}
Substituting Ohm's law for conductance then gives,
I G eq = I G 1 + I G 2 {\displaystyle {\frac {I}{G_{\text{eq}}}}={\frac {I}{G_{1}}}+{\frac {I}{G_{2}}}}
which in turn gives the formula for the equivalent conductance,
1 G eq = 1 G 1 + 1 G 2 . {\displaystyle {\frac {1}{G_{\text{eq}}}}={\frac {1}{G_{1}}}+{\frac {1}{G_{2}}}.}
This equation can be rearranged slightly, though this is a special case that will only rearrange like this for two components.
G eq = G 1 G 2 G 1 + G 2 . {\displaystyle G_{\text{eq}}={\frac {G_{1}G_{2}}{G_{1}+G_{2}}}.}
Notation[edit]
The value of two components in parallel is often represented in equations by two vertical lines, ∥, borrowing the parallel lines notation from geometry.[4][5]
R e q ≡ R 1 ‖ R 2 ≡ ( R 1 − 1 + R 2 − 1 ) − 1 ≡ R 1 R 2 R 1 + R 2 {\displaystyle R_{\mathrm {eq} }\equiv R_{1}\|R_{2}\equiv \left(R_{1}^{-1}+R_{2}^{-1}\right)^{-1}\equiv {\frac {R_{1}R_{2}}{R_{1}+R_{2}}}}
This simplifies expressions that would otherwise become complicated by expansion of the terms. For instance:
R 1 ‖ R 2 ‖ R 3 ≡ R 1 R 2 R 3 R 1 R 2 + R 1 R 3 + R 2 R 3 {\displaystyle R_{1}\|R_{2}\|R_{3}\equiv {\frac {R_{1}R_{2}R_{3}}{R_{1}R_{2}+R_{1}R_{3}+R_{2}R_{3}}}} .
Applications[edit]
A common application of series circuit in consumer electronics is in batteries, where several cells connected in series are used to obtain a convenient operating voltage. Two disposable zinc cells in series might power a flashlight or remote control at 3 volts; the battery pack for a hand-held power tool might contain a dozen lithium-ion cells wired in series to provide 48 volts.
Series circuits were formerly used for lighting in electric multiple unit trains. For example, if the supply voltage was 600 volts there might be eight 70-volt bulbs in series (total 560 volts) plus a resistor to drop the remaining 40 volts. Series circuits for train lighting were superseded, first by motor-generators, then by solid state devices.
Series resistance can also be applied to the arrangement of blood vessels within a given organ. Each organ is supplied by a large artery, smaller arteries, arterioles, capillaries, and veins arranged in series. The total resistance is the sum of the individual resistances, as expressed by the following equation: Rtotal = Rartery + Rarterioles + Rcapillaries. The largest proportion of resistance in this series is contributed by the arterioles.[6]
Parallel resistance is illustrated by the circulatory system. Each organ is supplied by an artery that branches off the aorta. The total resistance of this parallel arrangement is expressed by the following equation: 1/Rtotal = 1/Ra + 1/Rb + ... 1/Rn. Ra, Rb, and Rn are the resistances of the renal, hepatic, and other arteries respectively. The total resistance is less than the resistance of any of the individual arteries.[6]
See also[edit]
Network analysis (electrical circuits)
Wheatstone bridge
Y-Δ transform
Voltage divider
Current divider
Combining impedances
Equivalent impedance transforms
Resistance distance
Series-parallel partial order
Notes[edit]
^ Jump up to: a b c Resnick et al. (1966), Chapter 32, Example 1.
Jump up ^ Smith, R.J. (1966), page 21
Jump up ^ Resnick et al. (1966), Chapter 32, Example 4.
Jump up ^ http://www.en-genius.net/includes/files/avt_120406.pdf
Jump up ^ http://tex.stackexchange.com/questions/37912/how-to-draw-the-parallel-circuits-sign
^ Jump up to: a b Board Review Series: Physiology by Linda S. Costanzo pg. 74
References[edit]
Resnick, Robert and Halliday, David (1966), Physics, Vol I and II, Combined edition, Wiley International Edition, Library of Congress Catalog Card No. 66-11527
Smith, R.J. (1966), Circuits, Devices and Systems, Wiley International Edition, New York. Library of Congress Catalog Card No. 66-17612
Williams, Tim, The Circuit Designer's Companion, Butterworth-Heinemann, 2005 ISBN 0-7506-6370-7.
External links[edit]
Series circuit, Parallel circuit
Series and Parallel Circuits chapter from Lessons In Electric Circuits Vol 1 DC free ebook and Lessons In Electric Circuits series.
Series-Parallel Combination Circuits chapter from Lessons In Electric Circuits Vol 1 DC free ebook and Lessons In Electric Circuits series.
Sameen Ahmed Khan, How many equivalent resistances?, Resonance Journal of Science Education, Vol. 17, No. 5, 468-475 (May 2012).
Resistor combinations: How many values using 1K ohm resistors? - EDN magazine
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