059:008 Electrical Circuits Spring 2012 Exam I
Name:
1. (12 pts)
C
i
r
c
u
i
t
+

P
C
= 15 W
E
1
+

E
2
V
2
= 5 V
I
2
I
1
(i) In 15 seconds, 60 Coulombs of charge
Fows through the element
E
1
in the
direction of the arrow. How much energy
is required to move this charge?
a) 4 Joules
b) 12 Joules
c) 75 Joules
d) 300 Joules
e) 900 Joules
(ii) The power in the circuit connected to
the two elements
E
1
and
E
2
is 15 Watts.
If
I
1
is a current Fow as in the previous
question (60 Coulombs every 15 seconds)
what must the power in element
E
2
be?
a) 20 Watts
b) 5 Watts
c) 5 Watts
d) 20 Watts
e) 35 Watts
+

2I
X
E
1
E
3
+

E
2
I
X
+

+

2 A
P = 2 W
5 V
9 V
9 V
(iii) What is the current
I
X
in the circuit
shown?
a) 2.5 A
b) 2 A
c) 1.1 A
d) 2 A
e) 2.5 A
(iv) What is the power in the dependent
source?
a) 10 W
b) 5 W
c) 4 W
d) 5 W
e) 10 W
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View Full Document059:008 Electrical Circuits Spring 2012 Exam I
Name:
4. (12 pts)
4 k
Ω
6 k
Ω
12 k
Ω
I
S
I
T
I
1
I
2
I
3
(i) If
I
3
= 10 mA, what is the
current
I
1
?
a) 4 mA
b) 6 mA
c) 6.67 mA
d) 15 mA
e) 20 mA
(ii) If
I
3
= 10 mA as before and
I
S
and
I
T
are both
positive, which of the following is true?
a)
I
S
supplies power and
I
T
absorbs power
b)
I
S
absorbs power and
I
T
supplies power
c) Both
I
S
and
I
T
supply power
d) Both
I
S
and
I
T
absorb power
e) There is not enough information to determine
R
eq
R
1
(6 k
Ω)
R
2
(12 k
Ω)
R
3
(18 k
Ω)
R
4
(24 k
Ω)
R
5
(12 k
Ω)
R
6
(12 k
Ω)
R
7
(6 k
Ω)
(iii) Circle
ALL
that are true for the circuit
shown:
a)
R
1
and
R
2
are in series
b)
R
2
and
R
4
are in parallel
c)
R
2
and
R
5
are in parallel
d)
R
3
and
R
5
are in series
e)
R
4
and
R
6
are in series
(iv) The equivalent resistance
R
eq
for the
network is
a) 2
kΩ
b) 9
kΩ
c) 15
kΩ
d) 18
kΩ
e) 20
kΩ
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