PRACTICAL MATLAB® FOR ENGINEERS PRACTICAL MATLAB

150 Practical MATLAB® Applications for Engineers

MATLAB Solution

>> V = 10;

>> R1 = 1.0e3;

>> R2 = 250;

>> R3 = 0:10:500;

>> RP = (R2*R3)./(R2+R3); % equivalent resist. of R2 and R3

>> RT = R1+RP; % total resistance

>> I = V./RT;

>> I2 =( I.*R3)./(R2+R3);

>> I3 = (I.*R2)./(R2+R3);

>> plot (R3,I*1.0e3,’*’, R3, I2*1.0e3, ‘o’,R3,I3*1.0e3,’+’)

>> title (‘Currents vs Resistance R3’)

>> xlabel (‘Resistance R3 in Ohms’)

>> ylabel (‘Currents in Milli-Amperes’)

>> legend (‘I’,’I2’,’I3’)

>> grid on

FIGURE 2.48
Network of Example 2.9.

R 1 = 1 kΩ

V 0 = 10 V

−

+

I

R 2 = 250 Ω

I 2 I 3

R 3

0 Ω ≤ R 3 ≤ 500 Ω

FIGURE 2.49
Plots of Example 2.9.

500450400350300250

Resistance R3 in Ohms

200150100500

0

1

2

3

4

5

Currents in Milli-Amperes

6

7

8

9

10

I

I2

I3

Current versus Resistance R3