Laplace transforms: R series with RC parallel circuit: Difference between revisions

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: <math>v(t0)=0 Volts</math>
: <math>v(t0-)=0 Volts</math>


: <math>v(t)=10 Volts</math>
: <math>v(t)=10 Volts</math>
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Use Loop Equations to solve for the currents in <math>i_1</math> and <math>i_2</math>
Loop 1

:Loop 1


:<math>v(t)=R1(i_1+i_2)+R2(i_1)</math>
:<math>v(t)=R1(i_1+i_2)+R2(i_1)</math>


:<math>10=20(i_1+i_2)+30(i_1)</math>_______________________________________equation (1)
:<math>10=20(i_1+i_2)+30(i_1)</math>


:<math>i_1=(10-20i_2)/50</math>_______________________________________equation (1)



Loop 2
:Loop 2


:<math>v(t)=R1(i_1+i_2)+\dfrac{1}{C}\int{i_2 dt}</math>
:<math>v(t)=R1(i_1+i_2)+\dfrac{1}{C}\int{i_2 dt}</math>


:<math>10=20(i_1+i_2)+\dfrac{1}{0.1}\int{i_2 dt}</math>_______________________equation (2)
:<math>10=20(i_1+i_2)+\dfrac{1}{.1}\int{i_2 dt}</math>_______________________equation (2)




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Solving equations (1) and (2) simultaneously
Solving equations (1) and (2) simultaneously

:Equation 1 into equation 2 gives...

:






Revision as of 23:50, 21 October 2009

Problem Statement

Find the Voltage across the capacitor for t>=0:

Voltage across capacitor at t(0-)=0



Use Loop Equations to solve for the currents in and

Loop 1
_______________________________________equation (1)


Loop 2
_______________________equation (2)



Solving equations (1) and (2) simultaneously

Equation 1 into equation 2 gives...


Laplace Transform S-domain


Inverse Laplace transform T-domain


Voltage on Capacitor