308
Practical MATLAB
® Applications for Engineers
The voltage drop across the RL (in volts) is:
100009
2
599997
3
------ t - ------ t - 9/25 + 1000 t
100
50
The voltage drop across the CR (in volts) is :
4722366482869645
4
28334198901940237765045645
3
------------------t
+
----------------------t
37778931862957161709568
28334198897217871282176
4722366468702545765087065 2
+ ---------------------- t - 12000 t
4722366482869645213696
The power _ R(t) in watts is :
3
2
3
3
2
(t + t - 12 t) (1000 t + 1000 t - 12000 t)
The power _ L(t) (in watts) is:
3
2
2
(t + t - 12 t) (9/100 t + 3/50 t - 9/25)
The power _ C(t) (in watts) is:
3
2
/ 4722366482869645
4 4722366482869645
3
(t + t - 12 t) --------------- t + --------------t
\37778931862957161709568
28334198897217871282176
14167099448608935
2 \
- ------------------- t
|
4722366482869645213696
/
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
150
100
50
0
0
5
−50
−100
Amplitude (amps)
Amplitude
Amplitude
Amplitude
i(t) versus t
integral i(t) versus t
d[i(t)/dt] versus t
[i(t) 2 ] versus t
−5
15,000
10,000
5000
0
100
50
100
50
−50
0
0
−5
0
5
−5
0
5
−5
0
time
time
5
t
t
FIGURE 3.85
Plots of parts 1–4 of Example 3.20.
CRC_47760_CH003.indd 308
CRC_47760_CH003.indd 308
7/23/2008 1:27:54 PM
7/23/2008 1:27:54 PM