PRACTICAL MATLAB® FOR ENGINEERS PRACTICAL MATLAB

148 Practical MATLAB® Applications for Engineers

Example 2.8

Analyze the circuit diagram shown in Figure 2.46, over the range 0 ≤ R 2 ≤ 10 kΩ, in

linear increments of 10 Ω by returning the following plots:

1. R 2 versus I


2. R 2 versus V 2


3. R 2 versus V 1

FIGURE 2.45
Plots of Example 2.7.

Current and Power versus Resistance

Current

Power

1400

1200

1000

800

Current (mA), Power (Watts)

600

400

200

200 400 600 800 1000 1200

Resistance (Ohms)

1400 1600 1800 2000

0

FIGURE 2.46

Network of Example 2.8.

R 1 = 1 kΩ

V 0 = 10 V

+

−

R 2 V^2

I V 1

MATLAB Solution

>> R1 = 1.0e3;

>> V = 10;

>> R2 = 0:10:10000;

>> I = V./(R1+R2);

>> subplot (3,1,1)