EVIEW QUESTIONS 2.1 The reciprocl of resistnce is: () voltge () current (c) conductnce (d) couloms 2.2 An electric heter drws 10 A from 120-V line. The resistnce of the heter is: () 1200 () 120 (c) 12 (d) 1.2 4 " 3 V 6 " Figure 2.63 For eview Question 2.6. I 2.3 The voltge drop cross 1.5-kW toster tht drws 12 A of current is: () 18 kv () 12 (c) 120 V (d) 10.42 V 2.4 The mximum current tht 2W, 80 k resistor cn sfely conduct is: () 160 ka () 40 ka (c) 5 ma (d) 25 µa 2.5 A network hs 12 rnches nd 8 independent loops. How mny nodes re there in the network? () 19 () 17 (c) 5 (d) 4 2.6 The current I in the circuit in Fig. 2.63 is: () 0.8 A () 0.2 A (c) 0.2 A (d) 0.8 A 2.7 The current I o in Fig. 2.64 is: () 4 A () 2 A (c) 4 A (d) 16 A 2 A 10 A I o 4 A Figure 2.64 For eview Question 2.7.
2.8 In the circuit in Fig. 2.65, V is: () 30 V () 14 V (c) 10 V (d) 6 V 10 V 2.9 Which of the circuits in Fig. 2.66 will give you V = 7 V? 12 V 8 V V 3 V 3 V Figure 2.65 For eview Question 2.8. 1 V 1 V () () 2.10 The equivlent resistnce of the circuit in Fig. 2.67 is: () 4 k () 5 k (c) 8 k (d) 14 k 3 V 3 V 2 k" 3 k" 1 V (c) 1 V (d) eq 6 k" 3 k" Figure 2.67 For eview Question 2.10. Figure 2.66 For eview Question 2.9. Answers: 2.1c, 2.2c, 2.3, 2.4c, 2.5c, 2.6, 2.7, 2.8d, 2.9d, 2.10.
Section 2.2 Ohm s Lw 2.1 The voltge cross 5-k resistor is 16 V. Find the current through the resistor. 2.2 Find the hot resistnce of lightul rted 60 W, 120 V. 2.3 When the voltge cross resistor is 120 V, the current through it is 2.5 ma. Clculte its conductnce. 2.4 () Clculte current i in Fig. 2.68 when the switch is in position 1. () Find the current when the switch is in position 2. 2.7 Determine the numer of rnches nd nodes in the circuit in Fig. 2.71. 2 " 4 " i 5 " 5i 10 V 1 2 3 " 6 " 100 " i 150 " 3 V Figure 2.71 For Pro. 2.7. Figure 2.68 For Pro. 2.4.
Section 2.4 Kirchhoff s Lws 2.8 Use KCL to otin currents i 1,i 2, nd i 3 in the circuit shown in Fig. 2.72. 2.12 In the circuit in Fig. 2.76, otin,, nd v 3. 12 ma 2 10 V 1 8 ma i 2 i 1 9 ma i 3 20 V v 3 Figure 2.72 For Pro. 2.8. Figure 2.76 For Pro. 2.12. 2.9 Find i 1,i 2, nd i 3 in the circuit in Fig. 2.73. 2.13 Find nd in the circuit in Fig. 2.77. 1 A 2 A 6 V v 1 12 V 10 V 10 A i 1 3 A i 2 i 3 Figure 2.77 For Pro. 2.13. Figure 2.73 For Pro. 2.9.
2.17 Determine i o in the circuit of Fig. 2.81. 2.14 Otin through v 3 in the circuit of Fig. 2.78. i o 4 " v 1 36 V 5i o 24 V 12 V Figure 2.78 For Pro. 2.14. v 3 10 V 2.15 Find I nd V in the circuit of Fig. 2.79. 3 " 10 V 5 " 30 V V I 8 V Figure 2.79 For Pro. 2.15. Figure 2.81 For Pro. 2.17. 2.18 Clculte the power dissipted in the 5- resistor in the circuit of Fig. 2.82. 4 1 " V o 5 " Figure 2.82 For Pro. 2.18. 3V o 2.19 Find V o in the circuit in Fig. 2.83 nd the power dissipted y the controlled source. 4 " V o 10 A 6 " 2V o Figure 2.83 For Pro. 2.19.
Sections 2.5 nd 2.6 Series nd Prllel esistors 2.22 For the circuit in Fig. 2.86, find i 1 nd i 2. 2.24 Find,, nd v 3 in the circuit in Fig. 2.88. 14 " i 1 i 2 20 ma 6 k" 4 k" 40 V 15 " v 3 10 " Figure 2.86 For Pro. 2.22. 2.23 Find nd in the circuit in Fig. 2.87. Figure 2.88 For Pro. 2.24. 2.25 Clculte,i 1,, nd i 2 in the circuit of Fig. 2.89. 3 k" 4 " 6 " i 1 i 2 24 V 9 k" 12 V 3 " Figure 2.87 For Pro. 2.23. Figure 2.89 For Pro. 2.25.
2.28 Find i 1 through i 4 in the circuit in Fig. 2.92. 2.33 In the circuit of Fig. 2.97, find if V o = 4V. 10 i 4 i 2 20 16 40 i 3 i 1 30 20 V " 6 V o " 20 A Figure 2.97 For Pro. 2.33. 2.35 Find the equivlent resistnce t terminls - for ech of the networks in Fig. 2.99. Figure 2.92 For Pro. 2.28. 2.29 Otin v nd i in the circuit in Fig. 2.93. i 4 S 6 S 9 A S 2 S " 3 S () () (c) 3 2 3 Figure 2.93 For Pro. 2.29. (d) (e) Figure 2.99 For Pro. 2.35.
2.37 If eq = 50 in the circuit in Fig. 2.101, find. 2.41 Find eq t terminls - for ech of the circuits in Fig. 2.105. 30 10 70 eq 60 12 12 12 30 60 40 Figure 2.101 For Pro. 2.37. 20 2.39 Clculte the equivlent resistnce t terminls - for ech of the circuits in Fig. 2.103. 30 () 40 5 20 10 40 8 20 60 6 10 () 4 10 70 50 80 80 60 20 30 () Figure 2.105 For Pro. 2.41.