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Unformatted text preview: 9.3 Consider the sinusoidal voltage ’00) = 25 cos (40017: + 60°) V. a) What is the maximum amplitude of the voltage?
b) What is the frequency in hertz? c) What is the frequency in radians per second? d) What is the phase angle in radians? e) What is the phase angle in degrees? f) What is the period in milliseconds? g) What is the first time after t = 0 that v = 0 V? h) The sinusoidal function is shifted 5/ 6 ms to the right along the time axis. What is the expression
for '00:)? i) What is the minimum number of milliseconds
that the function must be shifted to the left if the
expression for v(t) is 25 sin 40017: V? 9.9 The voltage applied to the circuit shown in Fig. 9.5
at r = 0 is 75 cos (4000f — 60°) V. The circuit resist ance is 400 (I and the initial current in the 75 mH
inductor is zero. a) Find EU) fort 3: 0. 13) Write the expressions for the transient and
steadystate components of i(r). c) Find the numerical value off after the switch has
been closed for 750 as. d) What are the maximum amplitude, frequency
(in radians per second), and phase angle of the
steadystate current? e) By how many degrees are the voltage and the
steadystate current out of phase? 9.]1 Use the concept of the phasor to combine the fol
lowing sinusoidal functions into a single trigono
metric expression: a) y = 30 cos(200r — 160°) + 15 cos(200r + 70°),
b) y = 90 sin(50r — 20°) + 60 cos(200t  70°), c) y = 50 cos(5000t — 60°) + 25 8111(50001‘ + 110°)
— 75 cos(5000i‘  30°), d) y = 10 cos (wt + 30°) + 10 sin wt
+ 10 cos(wt + 150°). 9.14 The expressions for the steadystate voltage and current at the terminals of the circuit seen in
Fig. P914 are '08, = 300 cos (500017: + 78°) V, i, = 65111 (500011"! + 123°) A a) What is the impedance seen by the source? b) By how many microseconds is the current out of
phase with the voltage? 9.16 A 25 D. resistor and a 10 mII inductor are con PSPIEE nected in parallel. This parallel combination is also mum“ in parallel with the series combination of a 30 .0.
resistor and a 10 n13 capacitor. These three parallel branches are driven by a sinusoidal current source
whose current is 125 sin(2500t + 60°) A. a) Draw the frequencydomain equivalent circuit. b) Reference the voltage across the current source
as a rise in the direction of the source current,
and find the phasor voltage. c) Find the steadystate expression for v(t). 9.20 a) Show that at a given frequency w, the circuits in
Fig. P9.20(a) and (b) will have the same imped
ance between the terminals a,b if R2
R1: 2 2 a
1+wR2C2
C _ 1 + (0212365
1— . w2R%C2 b) Find the values of resistance and capacitance
that when connected in series will have the
same impedance at 40 krad/s as that of a
10000. resistor connected in parallel with a 50 nF capacitor. Figure P9.20
a a
R1
R2 C2 C1 1 b (a) (b) 9.23 Find the admittance Yab in the circuit seen in
Fig. P923. Express Yab in both polar and rectangu
lar form. Give the value of Yab in millisiemens. Figure P923
—j12.8 D. 1'10 .0 9.32 Find lb and Z in the circuit shown in Fig. P932 if
Vg = 25£°Vandla = 5 {90° A. Figure P9.3 2 9.34 Find the steadystate expression for '00 in the circuit
of Fig. P934 if £3, = 60 cos 10,000t mA. Figure P934 son ZuF 10 mH 100 D. ...
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 Fall '09
 Frequency, Hertz, Volt, 90°, 20°, 110°, 78°

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