The switch has been closes for a long time. At t=0 s the switch opens. Plot I1(t) in the interval -1 µs < t < 5 µs. R1=1 k, R2=3 k, C= 0.5 nF, VA=1 V and VB=2 V. Problem 2
The switch has been closed for a long time and at t=0 s it opens.
(A) What is the energy stored in the capacitor at t=0 s?
(B) At what time is the energy stored in the capacitor 1 nJ? Problem 3
The switch has been closed for a long time. At t=0 s it opens. VA=10 V, R1=1 k, R2=100 k, L=1 mH.
(A) What is the voltage over R2 at t=0+ s?
(B) What is the time constant for the inductor to release its stored energy?
Problem 4
The switch has been in position A for a long time. At t=0 s the switch moves to position B. At what time is the voltage VL over the inductor equal to VA?
R1=3 k, R2=100 , L=10 mH, I0=2 mA, VA=8 V. Problem 5
Assume the capacitor is discharged at t<0 s. At t=0 s the switch closes. Draw a graph showing the voltage over the capacitor, VC(t), in the interval -2 ms < t < 2 ms. Io= 1 mA and C= 1 µF. Problem 6
The graph shows an ac voltage (blue) and an ac current (red) as a function of time. Determine the frequency of the voltage and current. Using cos(t) as reference determine V(t)=Vocos(t+o) and I(t)=I1cos(t+1). That is determine the amplitud, and phase angle. Finally write down their representation as complex V and complex I.
