Transient Response of Circuits Using Differential Equations 249
Substituting all the given values in the equation, we get,
091
3101210
91
2
.
/
V
=−
−×××
−−
Ve
R
or 091
310
1210
9
12
.
=−
−×
××
−
−
e
R
or
e
R
−
××
−
=−
1
410
3
109
.
or
e
R
−
=
250
01
.
or −=
250
01
R
e
lo
g.
R
e
=−
=Ω
250
01
1087
log.
.
6.4 TRANSIENT RESPONSE OF R–L–C SERIES CIRCUITS
HAVING DC EXCITATION
Consider an R–L–C series circuit as shown Figure
6.18. Let us assume that the capacitor and inductor
are initially uncharged, that is, at t= 0, there is no
charge on L or C.
Let us fi nd the expression for current in the cir-
cuit when switch S is closed at t= 0. By applying
KVL, we get
VR
iL
di
dtC
idt=++
∫
1
Differentiating ...
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