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7. In Fig. 2.41, the potential of point A is-30 V. Using Kirchhoff's voltage law, find (a) value of V and (b) power dissipated by 5 2 resistance. All resistances are in ohms. [100 V; 500 W] 5 ww + 20 V- 10 V. 14 |11A 30 V 12 ww 60 V -30 V S18 312 8A 4 ww Fig. 2.41 Fig. 2.42

7. In Fig. 2.41, the potential of point A is-30 V. Using Kirchhoff's voltage law, find (a) value of V and (b) power dissipated by 5 2 resistance. All resistances are in ohms. [100 V; 500 W] 5 ww + 20 V- 10 V. 14 |11A 30 V 12 ww 60 V -30 V S18 312 8A 4 ww Fig. 2.41 Fig. 2.42

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
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7. In Fig. 2.41, the potential of point A is -30 V. Using Kirchhoff's voltage law, find (a) value of V and (b) power dissipated by 5 2 resistance. All resistances are in ohms. [100 V; 500 W] + 20 V- 10 ww A 14 11A Ž18 12 30 VI 12 ww 多2 60 V -30 Va 8A 4 ww Fig. 2.41 Fig. 2.42 Fig. 2.43 8. Using KVL and KCL, find the values of V and I in Fig. 2.42. All resistances are in ohms. [80 V; -4 A] 9. Using KCL, find the values V, I, 1, and I, in the circuit of Fig. 2.43. All resistances are in ohms. [VA = 12 V ; I, = 2/3 A; I, = 1 A; I,= 4/3 A] 10. A bridge network ABCD is arranged as follows : Resistances between terminals A-B, B-C, C-Đ, D-A, and B-Đ are 10, 20, 15, 5 and 40 ohms respec- tively. A 20 V battery of negligible internal resistance is connected between terminals A and C. Determine the current in each resistor. JAB = 0.645 A; BC = 0.678 A; AD = 1.025 A; DB = 0.033 A; DC= 0.992 A] 11. Two batteries A and B are connected in parallel and a load of 10 Qis connected across their terminals. A has an e.m.f. of 12 V and an internal resistance of 2 2; B has an e.m.f. of 8 V and an internal resistance of 1Q Use Kirchhoff's laws to determine the values and directions of the currents flowing in each of the batteries and in the external resistance. Also determine the p.d. across the external resistance. L =1.625 A (discharge), I=0.75 A (charge); 0.875 A; 8.75 V] 12. The four arms of a Wheatstone bridge have the following resistances; AB =100, BC= 10, CD=4, DA = 50 ohms. A galvanometer of 20 ohms resistance is connected across BD. Calculate the current through the galvanometer when a potential difference of 10 volts is maintained across AC.
Transcribed Image Text:7. In Fig. 2.41, the potential of point A is -30 V. Using Kirchhoff's voltage law, find (a) value of V and (b) power dissipated by 5 2 resistance. All resistances are in ohms. [100 V; 500 W] + 20 V- 10 ww A 14 11A Ž18 12 30 VI 12 ww 多2 60 V -30 Va 8A 4 ww Fig. 2.41 Fig. 2.42 Fig. 2.43 8. Using KVL and KCL, find the values of V and I in Fig. 2.42. All resistances are in ohms. [80 V; -4 A] 9. Using KCL, find the values V, I, 1, and I, in the circuit of Fig. 2.43. All resistances are in ohms. [VA = 12 V ; I, = 2/3 A; I, = 1 A; I,= 4/3 A] 10. A bridge network ABCD is arranged as follows : Resistances between terminals A-B, B-C, C-Đ, D-A, and B-Đ are 10, 20, 15, 5 and 40 ohms respec- tively. A 20 V battery of negligible internal resistance is connected between terminals A and C. Determine the current in each resistor. JAB = 0.645 A; BC = 0.678 A; AD = 1.025 A; DB = 0.033 A; DC= 0.992 A] 11. Two batteries A and B are connected in parallel and a load of 10 Qis connected across their terminals. A has an e.m.f. of 12 V and an internal resistance of 2 2; B has an e.m.f. of 8 V and an internal resistance of 1Q Use Kirchhoff's laws to determine the values and directions of the currents flowing in each of the batteries and in the external resistance. Also determine the p.d. across the external resistance. L =1.625 A (discharge), I=0.75 A (charge); 0.875 A; 8.75 V] 12. The four arms of a Wheatstone bridge have the following resistances; AB =100, BC= 10, CD=4, DA = 50 ohms. A galvanometer of 20 ohms resistance is connected across BD. Calculate the current through the galvanometer when a potential difference of 10 volts is maintained across AC.
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