An Introduction to Electrical Circuit Theory by G. Williams (auth.) PDF

By G. Williams (auth.)

ISBN-10: 0333233859

ISBN-13: 9780333233856

ISBN-10: 1349036374

ISBN-13: 9781349036370

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Similarly the second term is the current in mesh 1 if the source V2 acts alone. 12) and is seen to be the sum of the currents which flow when each source acts independently, which is the principle of superposition. , E. E. Staff (1940), Electric Circuits, John Wiley & Sons, New York. 23 Illustration of superposition Consider the circuit shown in fig. 23(a) in which the current flowing in the 4 n resistance is to be determined. Apply the principle of superposition and consider the sources acting individually.

The value of RT, the Thevenin equivalent resistance is equal to the 'dead' resistance of the network. This may also be explained by reference to fig. 28 TMvenin equivalence by the addition of a voltage source because if all the sources in the network are set to zero, that is the network is 'dead', the added source Vn will drive a current of iL in the opposite direction around the load. Thus the 'source' which is connected to the load consists of the added source vn plus the resistance of the 'dead' network.

9(b) and it is shown redrawn in fig. 9(c). 6 Sources At any instant of time a power and energy balance must exist in a network; that is, the amount of power being dissipated or stored in a network must equal the power being supplied. Until now only the circuit element which dissipates energy has been considered and the network components which supply energy to a system must now be examined. Practical sources, which include batteries, dynamos, alternators, etc. have varied characteristics which are usually non-linear and difficult to describe mathematically.

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An Introduction to Electrical Circuit Theory by G. Williams (auth.)


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