answer number 14.write your solution pls. EXAMPLE 8. When switch S, is open and switch Si is closed in Fig,Principle of Maximum Power Transfer. Large electrical systems arebecause, under this condition, the transmission efficiency is low and theoperating costs, which involve fixed charges and power losses, anever designed for maximum power transfer from generator to loadOn the other hand, this is not generally true of small battery circuits andcommunication networks for the reason that these systems usually handle406Solution100/30°120/10140/-30°120/105.5/-20° ampI- 6.6/-40 X(a)7.7/-80° amp(b) -- 6.6/-40° X(6-78) and I(5.2+j3). Calculate the15-9, the currents are I1current I, when switch S1 is open, and (a) switch S2 is closed to theand (b) switch Se is closed to the right.SPST switchTNetwork ofbilateral-linearimpedancesE-120/0SE=80/30°IE=90/60'DPDT switchFIG. 15-9 Circuit diagram for Example 8.aSolution(a) I = (6 – j8) +80/30°X (5.2 + j3) = (6 - j8) +80/30°120/0X 6/30120/0°SC= (6 - j8) + (2 + j3.47) = (8 - j4.53) amp%3D(b) I = (6- j8) –90/60°or%3DX 6/30° = (6 – j8) – (j4.5)120/0°(6- j12.5) amp%3Drelinhigh.Poarecomparatively little power and must he meintermittent in characterthemore intan 418ELECTRICAL CIRCUITS-ALTERNATING CURRENTthree impedances: E; = 120/30°, E: = 120/-30°, 21 = 2 ohms (resistance)Z; = 2/90° ohms (inductive reactance), Z = 10/-53.1°. CRlculate the vof the load current It and the voltage across the load, using the superpositiontheorem.5. Referring to Fig. 15-2a, interchange the sources of emf E, and E, makingE, = 120/-30° and E, 120/30°, and calculate the values of IL, EL, and P,8. The following particulars are given for the T-network of Fig. 15.4: E = 120/02Z. = 40 ohms (resistance), Z, = (15.6 + j19.2) ohms (resistance-inductive resc-tance), Z. = -j30 ohms (capscitive reactance), ZL = -j40 ohms (capacitiveresctance). Using Thévenin's theorem calculate the current through and thevoltage across the load impedance ZL.7. Using Thévenin's theorem calculate the load current and voltage, given the follow-ing dets: E = 120/0°, Z. = Z, = j9, Z. = 12, Zz = (3.68 - j8.76). (Refer toFig. 15:4.)8. Using the dats of Prob. 7, calculate the short-circuit current I, as illustratedin Fig. 15-5, for use in Eq. (145) (page 402); after evaluating this check the loadcurrent as determined by Thevenin's theorem in Prob. 7.9. The following information is given. in connection with Fig. 15-4: E = 120,0°,Z. = 12/-90°, Z, = 12/90°, Z. = 12, ZL = 8.5/45°. Calculate the load er-rent Is and the load voltage EL, using Thévenin's theorem.20. Solve Prob. 9 using Norton's theorem.11. Referring to Prob. 9, assume the same values for E, Z,, Z, and Z. If three losdimpedances Zı = S.5/45°, ZL: = 8.5/-45°, and Zz: = 8.5/0° are connected tothe output terminsls, calculate the values of I Lı, ILa, and IL:.A8. The current I = 15/-30° when E = 120/10° in Fig. 15.8a. Whst will be thecurrent I in Fig. 15-85 if E = 110/40°?18. In Fig. 15.8a the current I = 4.33 - j2.5 when E 110/0°. For what voltagein Fig. 15.8b will the current I be 6/30°?A. When switch S: is open and switch S, is closed in Fig. 15-9, the currents areI = (8 + j5) and I: (4 -j3). Calculate the current I when switch S: isopen and (a) switch S: is closed to the right, and (b) switch S; is closed to the left.16. A 48-volt battery has an internal resistance of 0.22 ohm and-is connected to avariable-resistance load through a line resistance of 1.28 ohms. For what valueof load resistance will the load power be a maximum, snd what will be the loidcurrent, load power, and power loss under this condition?16. A 228-volt constant-potential generator delivers load to a variable impedancewhose values ofR and X are readily adjustable. Assuming a "looking-bsek"impedance of (6 + j4.5) ohms calculate, for maximum load power, (a) the losdimpedance, (b) the current, (c) the load power and power factor.17. If the load in Prob. 16 is a variable resistor calculate, for maximum load power,the load resistance and power.18. If the load in Prob. 16 contains a constant inductive reactance of 3.5 ohms and avariable resistance, calculate, for maximum load power, (a) the load resistanceand impedance, (b) the load current and power.19. If the load in Prob. 16 contains a constant resistance of 4.8 ohms and a variavieinductive reactance, calculate, for maximum load power, (e) the load reaetanceand impedance, (b) the lond current and power.20. Referring to Fig. 15-13a, transfora the upper delta into an equivalent stardetermine the total current I as in Example 13.

Switches are used to make or break the circuit during the operation. Types of switches SPST(…

4. When switch S: is open and switch Si is closed in Fig. 15-9, the eurrents are I - (8 + j5) and I: (4- j3). Calculate the current I1 when switch S: is open and (a) switch S: is closed to the right, and (b) switch Sa is closed to the left.

4. When switch S: is open and switch Si is closed in Fig. 15-9, the eurrents are I - (8 + j5) and I: (4- j3). Calculate the current I1 when switch S: is open and (a) switch S: is closed to the right, and (b) switch Sa is closed to the left.

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

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