TAILIEUCHUNG - Electric Circuits, 9th Edition P13

Electric Circuits, 9th Edition P13. Designed for use in a one or two-semester Introductory Circuit Analysis or Circuit Theory Course taught in Electrical or Computer Engineering Departments. Electric Circuits 9/e is the most widely used introductory circuits textbook of the past 25 years. As this book has evolved over the years to meet the changing learning styles of students, importantly, the underlying teaching approaches and philosophies remain unchanged. | 96 Techniques of Circuit Analysis Substituting this relationship into the node 2 equation simplifies the two node-voltage equations to - 2 10 i 2 0. Solving for j and 2 gives 16 V and 2 10 V. Then _ 16 - 10 _ 1 o A - A l-44 5 W. A good exercise to build your problem-solving intuition is to reconsider this example using node 2 as the reference node. Does it make the analysis easier or harder Figure The circuit shown in Fig. with a reference node and the node voltages. assessment problem Objective 1 Understand and be able to use the node-voltage method a Use the node-voltage method to find the power associated with each source in the circuit shown. b State whether the source is delivering power to the circuit or extracting power from the circuit. Answer a p50v 150W p3il -144 W P5A -80 W b all sources are delivering power to the circuit. NOTE Also try Chapter Problems and . Figure A A circuit with a known node voltage. The Node-Voltage Method Some Special Cases When a voltage source is the only element between two essential nodes the node-voltage method is simplified. As an example look at the circuit in Fig. . There are three essential nodes in this circuit which means that two simultaneous equations are needed. From these three essential nodes a reference node has been chosen and two other nodes have been labeled. But the 100 V source constrains the voltage between node 1 and the reference node to 100 V. This means that there is only one unknown node voltage 2 - Solution of this circuit thus involves only a single nodevoltage equation at node 2 2 Vi Vi . ------ --5 0. 10 50 But Vf 100 V so Eq. can be solved for v2 2 125 V. The Node-Voltage Method Some Special Cases 97 Knowing t 2 we can calculate the current in every branch. You should verify that the current into node 1 in the branch containing the independent voltage source is A. In general when you use the node-voltage method to .

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