TAILIEUCHUNG - Electric Circuits, 9th Edition P28

Electric Circuits, 9th Edition P28. 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. | 246 Response of First-Order RL and RC Circuits across the capacitor in this circuit we need to find the Thevenin equivalent as seen by the capacitor. We leave to you to show in Problem that when the lamp is conducting l VTh Vmax - Vra e- - oV where Vrh V Th R Rl and rrlc T R Rl We can determine how Long the lamp conducts by setting the above expression for vL t to Xnin and solving for rc - ro giving C to RRLC Vmax - Vrh R Rl n vmin - vTh NOTE Assess your understanding of this Practical Perspective by trying Chapter Problems . Summary A first-order circuit may be reduced to a Thévenin or Norton equivalent connected to either a single equivalent inductor or capacitor. See page 214. The natural response is the currents and voltages that exist when stored energy is released to a circuit that contains no independent sources. See page 212. The time constant of an RL circuit equals the equivalent inductance divided by the Thévenin resistance as viewed from the terminals of the equivalent inductor. See page 216. The time constant of an RC circuit equals the equivalent capacitance times the Thévenin resistance as viewed from the terminals of the equivalent capacitor. See page 221. The step response is the currents and voltages that result from abrupt changes in de sources connected to a circuit. Stored energy may or may not be present at the time the abrupt changes take place. See page 224. The solution for either the natural or step response of both RL and RC circuits involves finding the initial and final value of the current or voltage of interest and the time constant of the circuit. Equations and summarize this approach. See page 232. Sequential switching in first-order circuits is analyzed by dividing the analysis into time intervals corresponding to specific switch positions. Initial values for a particular interval are determined from the solution corresponding to the immediately preceding interval. See page 236. An unbounded response .

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