Transient Response of Circuits Using Laplace Transform 333
8.7 SINUSOIDAL RESPONSE OF R–C SERIES CIRCUIT
Consider the R-C circuit with sinusoidal input as shown in Figure 8.16.
Applying KVL, we get the following form:
Vt
Rit
C
idt
m
sin()w=+
∫
1
Taking the Laplace transform on both sides, the equation
can be written as follows:
V
s
RIs
C
Is
s
R
Cs
Is
m
⋅
+
=+⋅
=+
w
w
22
1
1
()
()
()
V
s
RCs
Cs
Is
m
⋅
+
=
+
w
w
22
1
()
or Is
VCs
sR
Cs
()
()
()
=
⋅
++
m
w
w
22
1
=
⋅
++
VCs
RC
ss
RC
m
w
w()
22
1
=⋅
++
=⋅
+- +
V
R
S
ss
RC
V
R
S
sjsjs
RC
m
m
w
w
w
ww
()
()()
22
1
1
Is
V
R
A
sj
B
sj
C
s
RC
()=⋅
+
+
-
+
+
m
w
ww
1
(8.12)
Firstly, let us find the values of A, B and C
The value of
Asj
S
sjsjs
RC
S
sjs
RC
sj
s
=+⋅
+- +
=
-+
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