PRACTICAL MATLAB® FOR ENGINEERS PRACTICAL MATLAB

178 Practical MATLAB® Applications for Engineers

FIGURE 2.79
Plot of the power of L of Example 2.22 MATLAB Figure (11).

0 0.5 1 1.5 2 2.5 3

−0.06

−0.04

−0.02

0

0.02

0.04

0.06

time

PL(t) versus t

PL(t)

FIGURE 2.80
Plot of the power of C of Example 2.22 MATLAB Figure (12).

0 0.5 1 1.5 2 2.5 3

− 6

− 4

− 2

0

2

4

6

× 10 −^8

time

Pc(t) versus t

Pc(t)

Example 2.23

Determine the current i(t) for t ≥ 0 for each value of R, R = 1, 2, and 5 Ω for the RL circuit

diagram shown in Figure 2.81, assuming that the initial current is given by iL(0) = 0 A.

a. By hand calculations

b. By creating the script fi le RL that returns the symbolic MATLAB solution of the

loop differential equation, and

c. Each of the corresponding plots for i(t) versus t