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1. J. C. Maxwell, A Treatise on Electricity and Magnetism ( Clarendon Press, Oxford, 1892), pp. 407–408.
2. J. Jeans, The Mathematical Theory of Electricity and Magnetism ( Cambridge U.P., Cambridge, 1925), p. 323, article 358.
3. R. P. Feynman, R. B. Leighton, and M. Sands, The Feynman Lecture on Physics ( Addison-Wesley, Reading, MA, 1964), Vol. 2, Chap. 19.
4. D. A. Van Baak, “ Variational alternatives to Kirchhoff's loop theorem in dc circuits,” Am. J. Phys. 67, 36–44 (1999). A thermodynamic view of this approach is reported by Jose-Philippe Perez, “Thermodynamical interpretation of the variational Maxwell theorem in dc circuits,” Am. J. Phys. 68, 860–863 (2000).http://dx.doi.org/10.1119/1.19188
5. W. Millar, “ Some general theorems for non-linear systems possessing resistance,” Philos. Mag. Ser. 7 42, 1150–1160 (1951).http://dx.doi.org/10.1080/14786445108561361
6. F. L. Ryder, “ Network analysis by least powers theorems,” J. Franklin Inst. 254, 47–60 (1952).http://dx.doi.org/10.1016/0016-0032(52)90005-7
7. P. Penfield, Jr., R. Spence, and S. Duinker, Tellegen's Theorem and Electrical Networks ( MIT Press, Cambridge, MA, 1970), pp. 37–44.
8. G. F. Oster and C. A. Doser, “ Tellegen's theorem and thermodynamic Inequalities,” J. Theor. Biol. 32, 219–241 (1971).http://dx.doi.org/10.1016/0022-5193(71)90162-7
9. C. Cherry, “ Some general theorems for non-linear systems possessing reactance,” Philos. Mag. Ser. 7 42, 1161–1177 (1951).http://dx.doi.org/10.1080/14786445108561362
10. S. Ramo, J. R. Whinnery, and T. V. Duzer, Fields and Waves in Communication Electronics ( John-Wiley and Sons, NJ, 1994), Chap. 4.
11. R. M. Fano, L. J. Chu, and R. B. Adler, Electromagnetic Fields, Energy, and Forces ( MIT Press, Cambridge, MA, 1968), Chaps. 6 and 7.
12. G. Kirchhoff, “ On the solution of the equations obtained from the investigation of the linear distribution of galvanic currents,” IRE transactions on circuit theory, March, 1958, pp. 4–7 (English translation by J. B. O'toole).
13. R. Muller, “ A semiquantitative treatment of surface charges in DC circuits,” Am. J. Phys. 80(9), 782–788 (2012).http://dx.doi.org/10.1119/1.4731722
14.See, for example, Ref. 10, Sec. 4.10, and Chaps. 5 and 11.
15. L. O. Chua, C. A. Desoer, and E. S. Kuh, Linear and Non-linear Circuits ( McGraw-Hill, New York, 1987), Chap. 1.
16. B. D. H. Tellegen, “ A general network theorem, with applications,” Philips Res. Rep. 7, 259–269 (1952); available at https://newcatalog.library.cornell.edu/catalog/371415.
17. P. Penfield, Jr., R. Spence, and S. Duinker, “ A generalized form of Tellegen's theorem,” IEEE Trans. Circuit Theory 17(3), 302–305 (1970).http://dx.doi.org/10.1109/TCT.1970.1083145
18. For formal proofs as well as topological interpretations, see Ref. 7, pp. 21–22, or Ref. 15, pp. 29–34. In the electrical engineering literature, Eq. (1) is often presented as a special case of “Tellegen's Theorem,” which can be used to study various useful and interesting network relations (see Refs. 7 and 17).
19. The functional S is first introduced by W. Millar (Ref. 5). He defined each term in the integral as the “co-content” of the component and proved the following: “if in an active non-reactive network the sum of co-contents of all elements is expressed in terms of the defining number of generalized current coordinates in the network, subject to only to the restriction of Kirchhoff's current law, then S is stationary for the actual distribution of currents.” He also showed that for networks with time-invariant components, the “co-content” will be an invariant of the motion. A more general discussion of function S and non-linear resistors can be found at Ref. 7, pp. 37–41.
20.This can be observed by plotting the voltage vs current for the components and comparing the area difference δS for the variations around the operating point.
21.See Ref. 5 or Ref. 7, pp. 37–44.
22. A. A. P. Gibson and B. M. Dillon, “ The variational solution of electric and magnetic circuits,” IEEE Eng. Sci. Educ. J. 4(1), 5–10 (1995).http://dx.doi.org/10.1049/esej:19950104
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