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EE 70 Final Exam
Closed Book, Calculators Allowed
Two Pages of Notes Allowed (8.5” x 11”, both sides ok)
Tuesday, December 9th (8 am – 11 am)
Please do all of your work on a separate sheet of paper
Final answers should be circled next to your work
To receive full (or partial) credit, you must show your work
Unless otherwise specified, each question is worth two points
For problems 1–3, consider the following circuit:
R
1
R
2
V
s
L
C
Given
V
s
= 2e
0j
,
ϖ
= 2, R
1
= 4
Ω
, R
2
= 4
Ω
, L = 2 H, and C = 0.25 F.
The objective is to
use mesh analysis to find the two mesh currents.
1.
Using KVL, write two equations in terms of phasor voltages. (Redraw the circuit
and clearly define the phasor voltage polarities) Convert the phasor voltages of
the passive elements into phasor currents. (make sure to clearly define your
phasor currents)
2.
Solve for the two mesh currents.
Show all steps. (“done on calculator” is not a
sufficient answer and will not result in full credit)
Answers can be left in phasor
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 Spring '11

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