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2(i01. - i13 ) + 4(i01. ) = 0 mesh abd mesh acb mesh bed Simplifying gives = 10 -2i01. 3- 3i'Y = 0 -4i01. 3- 4i'Y Thus three equations exist to determine the three unknown mesh currents. 3; the matrix of the coefficients of the equations is rl-4~~ :~ =; -3 +9 about which the following points should be noted: (i) All the terms on the principal diagonal are positive (ii) All the other terms are negative (iii) The matrix is symmetrical about the principal diagonal All the terms may be written down by inspection from the problem.

E. E. Staff (1940), Electric Circuits, John Wiley & Sons, New York. METHOD OF ANALYSIS AND NETWORK THEOREMS 53 resistances of a two-port network may be connected in a T (or Y) configuration or a IT (or b. or mesh) configuration and their values are most easily calculated by means of the pertinent two-port parameters. 2. 1 Two-port parameters Consider the general two-port linear resistive network shown in fig. 33. 6. 33 General two-port, linear, resistive network and which two are the dependent variables, as a choice exists.

2 The basic method of network ana~ysis A network consisting of b branches has 2b unknown variables which require a total of 2b equations to obtain their solution. It is therefore necessary to examine the available equations to determine whether there are sufficient. lt is necessary first, however, to state what the variables are, as a choice exists. The obvious choice for the variables in a problem are the branch voltages and currents but there are many other sets of variables which may be used.

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