E245B Exam II
November 6, 2001
Name: SSN: Pledge:
Questions are worth 20 points each. !"#$%&'(1
Find Io in the circuit shown using linearity and the assumption that Io = 1mA.
I2 12K
4K
I3
4K 4mA
4K 4K I1 2K
+ -
V1 -
)*+&,-&.()#%*-/#0(
+
Io = 1 A k
I2 12K
E245B HW #6, 10/25/01
Problem 5.64 For the network in Figure P5.64 choose C such that vo = -10 vs dt
C
Rs=10K +
70K
+ Vs RL vo -
Figure P5.64
Suggested Solution
C i2 i1 Rs 70K 0 + Vs RL vo -
Rs = 10 K vo = -10 vs dt R e q = Rs + 70 K = 80 K Using ideal op
HW #5 Solutions E245B
10/11/01
Problem 5.1
A 12F capacitor has an accumulated charge of 480C. Determine the voltage across the capacitor after 4 s.
Suggested Solution
t2
v(t 2) - v(t1) =
1 C
t1 v(t 1) = 0. v(t 2) = 40V
i(t )dt
C = 100 F
i (t ) = 1mA = I
!"#$%&'()*+( Find Io in the circuit shown using linearity and the assumption that Io = 1mA.
I2 12K
4K
I3
4K 4mA
4K 4K I1 2K
+ -
V1 -
,-.&/0&1(,#%-02#3(
+
Io = 1 A k
I2 12K
4K V2
I3 IT
4K
4K 4K I1 2K
If Io =
1 k
A
1 Then V 2 = k (4 K + 2 K ) = 6V , I 1 =
T
HW #2 Solutions E245B
Problem 2.10
Find I1 and I 2 in the circuit shown. I3 = 5 mA IS I1 I6 = 3 mA I2
I4 = 6 mA
Suggested Solution
By KCL, I1 = I 4 = 6 mA
Also, I 6 + I 2 = I 4 or 0.003 + I 2 = 0.006 I 2 = 3 mA
Problem 2.14
Find I x , I y and I z in the n
!"#$%&'()*)(
If 60 C of charge pass through an electric conductor in 30 seconds, determine the current in the conductor.
+,-&./&0(+#%,/1#2(
i= Q 60 = =2A t 30
i =2A
!"#$%&'()*7
Determine the amount of power absorbed or supplied by the element shown if (a)
E245B REVIEW Session 12/5/01
Final in Class, 12/5/01
You cannot bring homework or review solutions to the final. Only two cheat sheets with formulas or small notes.
Problem 7.28
Find the frequency domain voltage V0 as shown. 6 -j2 +
+-
10-90V
j10
Vo _
Sug