EE 313  Extra Credit II
Fall 2010
You must show your work to receive credit
1.
[2 points] Consider the following circuit:
1ohm
4
V
X
+

+

1ohm
j1 ohms
j1 ohms
24
0
o
V
+
V
X

1 ohm
What is the total complex power delivered by each source?
24
∠
0º delivers ________________
4
V
X
delivers _________________
What is the real power absorbed by the leftmost 1 ohm resistor and the j1 ohm inductor?
1 ohm absorbs ________________
j1 ohm absorbs _________________
2.
[3 points] Consider the following single phase circuit:
+
_
Z
1
Z
3
Z
2
V
S
I
S
I
1
I
2
I
3
Load 1 – 10kVA at PF=.6 lagging
Load 2 – 10kW at PF = 1
Load 3 – 6kVAR at PF=.2 leading
a)
Find the total complex power delivered by the source.
S
= __________________
S
b) What is the source current magnitude?
I
S
= __________________
c)
Can the source current magnitude be reduced by 50%
(circle) yes or no
without changing the real power delivered or the source
voltage magnitude?
What will the power factor of the source be?
PF
S
______________
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[3 points] You are given a balanced three phase Yconnected source where V
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 Fall '09
 ENGLISH
 Resistor, 2k, Electrical impedance, 1 ohm, 5 K

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