6_Ch 18 College Physics ProblemCH18 Direct-Current Circuits

6_Ch 18 College Physics ProblemCH18 Direct-Current Circuits...

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104 CHAPTER 18 Problem Solutions 18.1 From ( ) VIRr + ∆= , the internal resistance is 9.00 V 72.0 4.92 0.117 A = − Ω = V rR I =− 18.2 (a) 123 4.0 8.0 12 24 eq RR =++= +Ω + Ω = Ω (b) The same current exists in all resistors in a series combination. 24 V 1.0 A 24 eq V I R == = (c) If the three resistors were connected in parallel, 1 1 111 1 1 1 2.18 4.0 8.0 12 eq R RRR  =++ = + +  ΩΩΩ  Resistors in parallel have the same potential difference across them, so 4 I 4 24 V 6.0 A 4.0 V R == = , 8 24 V 3.0 A 8.0 I , and 12
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