22_Ch 18 College Physics ProblemCH18 Direct-Current Circuits

22_Ch 18 College Physics ProblemCH18 Direct-Current...

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120 CHAPTER 18 18.29 Applying Kirchhoff’s junction rule at junction a gives (1) Using Kirchhoff’s loop rule on the leftmost loop yields 31 III =+ ( 2 ) ( ) 4.00 5.00 12.0 V 0 II + 9 . 0 0 A () ( 3.00 V −− 13 54 += = or (2) and for the rightmost loop, ) 32 4.00 3.00 2.00 18.0 −+ + 15.0 A 12 3 A, 1.523 A, and 1.846 A I == = 3.00 V 23 5 4 0.323 ( V 0 = or (3) Solving equations (1), (2), and (3) simultaneously gives Therefore, the potential differences across the resistors are ) 22 2 VI ∆= .00 3.05 V = , ( ) 3.00 4.5 7 V = ( ) 43 4 .00 7.3 8 V = , and ( ) 51 5 .00 1.62 V = 18.30 The time constant is RC τ = ( . Considering units, we find ) Volts Coulombs Coulombs
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This note was uploaded on 12/09/2011 for the course PHYS 2020 taught by Professor Staff during the Fall '10 term at FIU.

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