TAILIEUCHUNG - Electric Circuits, 9th Edition P12

Electric Circuits, 9th Edition P12. 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. | 86 Simple Resistive Circuits Sections Resistor networks are sometimes used as volume-proSblem control circuits. In this application they are referred to as resistance attenuators or pads. A typical fixed-attenuator pad is shown in Fig. . In designing an attenuation pad the circuit designer will select the values of R and R2 so that the ratio of v Iv-f and the resistance seen by the input voltage source Rab both have a specified value. a Show that if Rab RL then Rl 4R 1 Ä2 v Rl Vj 2R R2 Rl b Select the values of R and R2 so that Rab l 600 fl and vo vt . c Choose values from Appendix H that are closest to 7 and R2 from part b . Calculate the percent error in the resulting values for Rab and v v if these new resistor values are used. Figure a AW Ry c AW Ry b rl__ Attenuator AW Ry d a The fixed-attenuator pad shown in Fig. is pSm called a bridged tee. Use a Y-to-A transformation to show that Rab RL if R RL. b Show that when R RL the voltage ratio vo v equals . Figure Fixed-attenuator pad DESIGN PROBLEM The design equations for the bridged-tee attenuator circuit in Fig. are 2RR R - 5 7 3R2 - Rl v _3R-RL v-t 3R RL when R2 has the value just given. a Design a fixed attenuator so that d - when RL 300 fl. b Assume the voltage applied to the input of the pad designed in a is 42 V. Which resistor in the pad dissipates the most power c How much power is dissipated in the resistor in part b d Which resistor in the pad dissipates the least power e How much power is dissipated in the resistor in part d a For the circuit shown in Fig. the bridge is pspice balanced when AR 0. Show that if AR K Ro MULTISIM . . . the bridge output voltage is approximately -ARR4 V. R RJ2 b Given R2 1 kû. R 500 -Q RA 5 kil. and Din - 6 V what is the approximate bridge output voltage if AR is 3 of R c Find the actual value of vo in part b . Figure Problems 87 a If percent error is defined as error approximate

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