Download A Textbook of Electrical Technology in SI Units. Volume I: by B. L. Theraja PDF

By B. L. Theraja

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Additional resources for A Textbook of Electrical Technology in SI Units. Volume I: Basic Electrical Engineering

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26 Solution. Simplifying the series-parallel combinations, and solving the circuit, the source current is to amp. With respect to 0, VA=40, VB =40 - 16 = 24 volts. 6 amp, which is the required answer. Further 14=24 amp. 80 80 80 120 Fig. 27 Tutorial Problems 120 F'Ig. 29 120 Fig. 28 No. 3 1. Find the current supplied by the battery in the circuit of Fig. 27. 2. Compute total circuit resistance and battery current in Fig. 28. [8/3 n, 9 A] 3. Calculate battery current and equivalent resistance A of the network shown in Fig.

These resistors have highest stability and highest power rating. Because of their bulk, high-power ratings and high cost, they are not suitable for low-cost or high-density, limited-space applications. The completed wire-wound resistor is coated with an insulating material such as baked enamel. (g) Cermet (Ceramic Metal) The cermet resistors are made by firing certain metals blended with ceramics on a ceramic substrate. The value of resistance depends on the type of mix and its thickness. These resistors have very accurate resistance values and show high stability even under extreme temperatures.

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 across it is given by the relation : i = kenwhere i = instantaneouscurrent,e is the instantaneous voltage and 11is a constant whose value depends on the metal oxides used. The value of 11for silicon-carbide-based varistors lies between 2 and 6 whereas zinc-oxide-based varistors have a value ranging from 25 to 50.

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