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Additional resources for Schaum's outline of theory and problems of basic circuit analysis
The negative signs are the result of nonassociated references. Of course, all the actual resistor currents leave the top node. Note that the parallel current sources have the same effect as a single current source, the current of which is the algebraic sum of the individual currents from the sources. 45 Use current division to find the currents I , and I , in the circuit shown in Fig. 3-21. The sum of the currents from current sources into the top node is 190 - 50 + 60 = 200 A. Also, the sum of the conductances is 6 + 12 + 24 + 8 = 50 S.
18 a = 1,’p and A = n(d 2)’. Of course, the re- The resistance of a certain copper power line is 100 R at 20 C. What is its resistance when the sun heats up the line to 38 C? 5 C, which is T , in the formula R , = R l (T, - 7;)) ( T, - To). Also, from the given data. T2 = 38 C, R , = 100 R, and Tl = 20 C. 5-A current flows, causing the temperature of the tungsten filament to increase to 2600-C. What is the resistance of the light bulb at the normal room temperature of 20’C? 5 = 240 R. 20 A certain unenergized copper transformer winding has a resistance of 30 R at 20 C.
On a circuit diagram it is indicated by two terminals not connected to anything no path is shown for current to flow through. A n open circuit is sometimes called an o p n . A short circuit is the opposite of an open circuit. It has zero voltage across it for any finite current flow through it. On a circuit diagram a short circuit is designated by an ideal conducting wire a wire with zero resistance. A short circuit is often called a short. Not all open and short circuits are desirable. Frequently, one or the other is a circuit defect that occurs as a result of a component failure from an accident or the misuse of a circuit.