PRACTICAL MATLAB® FOR ENGINEERS PRACTICAL MATLAB

274 Practical MATLAB® Applications for Engineers

MATLAB Solution

% Script file: curr _ volt

W = 300;

R = 19;

L = 60e-3;

Ang = W*L/R;

t = [0:.0001:.06];

V = (R^2+(W*L)^2)^.5*5*sin(W.*t+atan(Ang));

subplot(2,1,1)

I = 5*sin(W.*t);

plot (t,V), title(‘ v(t) vs. t’)

grid on

ylabel(‘Amplitude in volts’), title(‘v(t) vs.t’)

subplot(2,1,2)

plot(t,I)

grid on

title(‘i(t) vs. t’), ylabel(‘ Amplitude in amps’)

xlabel(‘time in sec.’)

The script fi le curr_volt is executed and the resulting plots are shown in Figure 3.55.

FIGURE 3.55
Plots of Example 3.6.

200

100

0

0

0

0.01 0.02 0.03 0.04 0.05 0.06

0 0.01 0.02 0.03

time in sec.

0.04 0.05 0.06

− 100

− 200

− 5

v(t) versus t

i(t) versus t

Amplitude in volts

Amplitude in amps

5