By B.L. Teraja, A.K. Teraja
A textbook of electric expertise: quantity 2 ac and dc machines elaborately covers the subjects, ac and dc machines, that's part of electric expertise. electric expertise, as a subject matter, covers numerous divisions of electric engineering like simple electric engineering, electronics, regulate platforms, instrumentation and communique platforms. The ebook discusses and explains a variety of theories regarding ac and dc machines. The chapters encompass a variety of routines, examples, and a number of illustrations that reduction in figuring out the topic greater. This e-book is acceptable for college students, and has been written in easy language. a number of solved examples assist in simplifying the subject material, and the illustrations make it visually extra attractive to scholars. the themes lined within the booklet variety from dc turbines and dc vehicles to alternators and synchronous cars. exact value has been laid on chapters discussing vehicles. the target try out part has additionally been rigorously revised to help the readers greater. The twenty third revised variation of a textbook of electric know-how: quantity 2 ac and dc machines used to be released via s chand publishing in 2006. it truly is to be had in paperback. Key good points: this illustrated version provides advanced fabric in an built-in and rational series for b. E. , b. Tech. , and different similar commencement classes.
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Example text
Such resistors have a tendency to produce electric noise due to the current passing from one carbon particle to another. This noise appears in the form of a hiss in a loudspeaker connected to a hi-fi system and can overcome very weak signals. That is why carbon composition resistors are used where performance requirements are not demanding and where low cost in the main consideration. Hence, they are extensively used in entertainment electronics although better resistors are used in critical circuits.
30 (b). Fig. 30 (c) shows how the resistance of an incandescent lamp increases with voltage whereas Fig. 30 (d) shows the V-I characteristics of a typical silicon diode. For a germanium diode, current is related to its voltage by the relation. 19. Varistor (Nonlinear Resistor) It is a voltage-dependent metal-oxide material whose resistance decreases sharply with increasing voltage. The relationship between the current flowing through a varistor and the voltage applied n across it is given by the relation : i = ke where i = instantaneous current, e is the instantaneous voltage and ηis a constant whose value depends on the metal oxides used.
34. For the given circuit find the current IA and IB. [Bombay Univ. 1991] Solution. Nodes A, B, C, D and reference node 0 are marked on the same diagram. IA and IB are to be found. Apply KCL at node A. From C to A, current = 7 + IB At node 0, KCL is applied, which gives a current of 7 + IA through the 7 volt voltage source. Applying KCL at node B gives a current IA −IB through 2-ohm resistor in branch CB. Finally, at node A, KCL is applied. This gives a current of 7 + IB through 1-ohm Fig. 24 resistor in branch CA.