Explanation Given information: Consider a series circuit consisting of a resistor of R ohms, an indicator of L, and a variable voltage source of V ( t ) volts (time t in seconds). The current through the circuit I ( t ) (in amperes) satisfies the differential equation d I d t + R L I = 1 L V ( t ) , L = 4 H , R = 500 Ω and V = 20 cos ( 80 t ) v o l t s . Formula used: ∫ e a x cos ( b x ) d x = 1 a 2 + b 2 ( e a x ( a cos b x + b sin b x ) ) + C . The general solution of y ' + P ( x ) y = Q ( x ) is y = 1 α ( x ) ( ∫ α ( x ) Q ( x ) d x ) where α ( x ) , an integrating factor: α ( x ) = e ∫ P ( x ) d x . Calculation: d I d t + R L I = 1 L V ( t ) (Given) L = 4 H , R = 500 Ω a n d V = 20 cos ( 80 t ) v o l t s Then the differential equation becomes d I d t + 500 4 I = 1 4 20 cos ( 80 t ) d I d t + 125 I = 5 cos ( 80 t ) <

3rd Edition

ISBN: 9781464125263

Author: Jon Rogawski, Colin Adams

Publisher: W.H. Freeman & Co

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Chapter 10.4, Problem 38E

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The solution for I(t) , assuming that L=4 H,R=500 Ω and V=20cos(80t) volts .

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Chapter 10.4, Problem 37E

Chapter 10.4, Problem 39E

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The solution for I ( t ) , assuming that L = 4 H , R = 500 Ω and V = 20 cos ( 80 t ) v o l t s .

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The solution for I(t) , assuming that L=4 H,R=500 Ω and V=20cos(80t) volts .

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