
Transient Response of Circuits Using Differential Equations 243
R
e
=
−
∞
The steady-state value of capacitor voltage can be written as in the following:
VVt
Ve
Ve
V
V
t
t
t
RC
ss C
Lt
Lt
=
=−
=−
→
→
−
∞
∞
∞
()
()
1
1
10
-
6.3.2 Case II: Discharging of Capacitor
Now, let us consider a discharging case, that is, when the fully charged capacitor is disconnected
from DC supply. Let the switch is moved to position K
1
, as shown in Figure 6.14.
Now, the direction of current is opposite to that
of the previous case.
Let us apply KVL, we get the following:
Ri
C
idt
∫
1
Differentiating the equation with respect to time,
we can form the equation as ...