Transient Response of Circuits Using Laplace Transform 329
=
+
--
2000
1
979 8
2001
22
eL
s
t
(.)
=×
-
2000
1
979 8
200
et
t
.
sin 979.8
∵
L
sa
a
at
-
+
=
1
22
11
sin
=
-
2000
979 8
979 8
200
.
si
n.et
t
i(t) = 2.04 e
-200t
sin 979.8t
8.6 SINUSOIDAL RESPONSE OF R–L SERIES CIRCUIT
We will now find the transient response of circuits to sinusoidal inputs.
Consider the R–L circuit shown in Figure 8.15.
Applying KVL, the following equation is obtained:
VR
itL
di
dt
m
sin()wt
=+
Taking the Laplace transform on both sides, we get the
equation as follows:
VLtRIsLs
Is
m
[sin](
)(
)
w=+
or V
s
RsLIs
m
w
w
22
+
=+
()()
or Is
V
sR
sL
()
()
()
=
++
w
w
m
22
=
+-+
w
ww
V
sjsjRsL
m
()()
()
or Is
V
L
sjsjs
R
L
()
()()
=
+- +
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