PRACTICAL MATLAB® FOR ENGINEERS PRACTICAL MATLAB

214 Practical MATLAB® Applications for Engineers

P.2.19 The current iC(t) through a capacitor C = 1 μF is shown in Figure 2.115.
Write a MATLAB program that returns the following plots:
a. The voltage vC (t) versus t
b. The energy Wc(t) versus t over the range 0 ≤ t ≤ 10 s

P.2.20 The voltage across the inductor L = 1 mH is shown in Figure 2.116. Write a MATLAB
program that returns the following plots:
a. The current iL(t) versus t
b. The energy wL(t) versus t over the range 0 ≤ t ≤ 10 s

P.2.21 The RC circuit shown in Figure 2.117 presents an initial voltage vC(0) = 0 V at the
instant the switch closes at t = 0.

Write a program that returns the following plots over the range 0 ≤ t ≤ 5 s:

a. Current i(t) versus t

b. Voltage vR(t) versus t

c. Voltage vC(t) versus t

d. Energy wC in Joules stored in C versus t

e. Instantaneous power in watts dissipated by R versus t

FIGURE 2.119
Networks of P.2.23.

L 1

V

vL1 vL2

vC1 vC2

L 2 C 1 C 2

(a) (b)

V

+

−

+

−

FIGURE 2.118

Network of P.2.22.

Switch closes at t = 0

L = 1 mH

R = 1 kΩ

100 V

i(t)

FIGURE 2.117
Network of P.2.21.

Switch closes at t = 0

R = 1 kΩ

C = 1 mF

100 V

i(t)