H9P1: Response to a Delayed Impulse

L=20.0H and C=20.26mF.
A=2/π=0.64 Coulombs at time t=9.0s.

B. At the initial time what is the total energy, in Joules, stored in the circuit?

C. At the time just before the impulse happens t=9.0− what is the total energy, in Joules, stored in the circuit?

E. At the time just before the impulse happens what is the voltage vC(9.0−), in Volts, across the capacitor?

Question

H9P1: Response to a Delayed Impulse

L=20.0H and C=20.26mF. 
A=2/π=0.64 Coulombs at time t=9.0s. 

B.  At the initial time what is the total energy, in Joules, stored in the circuit? 

C.  At the time just before the impulse happens t=9.0− what is the total energy, in Joules, stored in the circuit? 

E.   At the time just before the impulse happens what is the voltage vC(9.0−), in Volts, across the capacitor?

anonymous · Answer

How to calculate IL?

anonymous · Answer

4) iL (9) = cos(2*pi*f*t)
For your example, frequency f = 0.25Hz
so, iL = cos(2*pi*0.25*9)=0

anonymous · Answer

how to calculate vc?

anonymous · Answer

vc = -L*2*pi*f*sin(2*pi*f*t)
Remember to keep your calculator mode in radian