The University of British Columbia
Department of Electrical and Computer Engineering
EECE 253 Circuit Analysis II
Quiz 2 28 February 2007
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Signature: _ Student ID: _
Exam Time: 50 minutes.
This quiz consists of 10 pages. Please che
Problem #1: Consider the circuit shown.
a. (7pts) Determine, in symbolic form (ie, as a function of the
component values), the resonant frequency.
b. (Spts) If Rl =100§.>.,R2 = 600, L =10mHandC =1,uF,
compute the resonant frequency and the impedance seen
Problem #1: Compute vo(t) if vs(t) =3cos(2500t+20)V.
Problem #2: Consider the circuit.
a) Find the Thevenin equivalent circuit
seen by resistor R.
b) If R=2, compute Vo in polar form.
Problem #3: Consider the circuit shown with is(t)=2sin(3t-45)
v2 leads by 55 degrees
(v1 lags by 55)
-cos term becomes: sin(wt+45-180+90)=sin(-45)
Which is 55 difference from 10
v2 lags by 55
v1 leads by 55
I=jwCV > Zc=1/(jwC)
a) 1 point
Instantaneous power in three-phase circuits is constant (not pulsating).
For the same amount of power, three phase systems are more economical than single
phase, i.e. the amount of wiring required for a three
Voltage drop across a coil in loop 1 with
mutual inductance from loop 2:
EECE 253 Final Formulas
Time- vs. PhasorDomain