PRACTICAL MATLAB® FOR ENGINEERS PRACTICAL MATLAB

Direct Current and Transient Analysis 221

FIGURE 2.132

Network of P.2.40.

V = 12 V

Switch moves down at t = 0

+

−

R = 2 Ω

R 1 = 6 Ω L = 9 H

R 2 = 3 Ω

L 2 = 5 H

i 1 (t) i 2 (t)

P.2.41 Steady-state conditions exist for t ≤ 0 in the circuit shown in Figure 2.133 (while

the voltage source is connected to the circuit). At t = 0 +, the switch moves upward

disconnecting the source. Obtain expressions and the respective time plots for each

transient loop current.

P.2.42 Steady-state conditions exist for t ≤ 0 in the circuit of Figure 2.134 (while the volt-

age source is connected to the circuit). At t = 0 +, the switch moves downward

FIGURE 2.133

Network of P.2.41.

V = 16 V

+

−

C 2 = 1/6 F

R = 4 Ω

R 1 = 7 Ω

R 4 = 5 Ω R 3 = 2 Ω R 2 = 3 Ω

Switch opens at t = 0

C 1 = 1/3 F

I 1 I 2 I 3

FIGURE 2.134

Network of P.2.42.

V = 16 V

Switch moves down at t = 0

R 2 = 6 Ω

R 1 = 3 Ω

R = 4 Ω

+

−

C 1 = 1/3 F

= 2 H