
Transient Response of Circuits Using Laplace Transform 321
8.2 CIRCUIT ELEMENTS IN THE s-DOMAIN
8.2.1 Resistor in the s-Domain
Consider a resistor R in a circuit, as shown in Figure 8.1, where
the current and voltage are shown in time domain as i(t) and
v(t), respectively.
By ohm’s Law, we get the following form:
V = iR
Taking Laplace transform on both sides, we get the following equation:
L[v] = RL[i]
or V(s) = RI(s) (8.1)
This equation shows that the resistance element does not change
while going from t-domain to s-domain.
The s-domain equivalent circuit of Figure 8.1 is shown in
Figure 8.2.
8.2.2 Inductor in s-Domain
Let us consider an inductor ...