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Szpilka - Electric Circuit Analysis 1/e (Homework)

James Finch

Engineering, section 1, Fall 2019

Instructor: Dr. Friendly

Current Score : 0 / 14

Due : Sunday, January 27, 2030 12:00 EST

Last Saved : n/a Saving...  ()

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    Here are some textbook questions from Electric Circuit Analysis 1/e by Anthony Szpilka published by WebAssign. Click here for a list of all of the questions coded in WebAssign. This demo assignment allows many submissions and allows you to try another version of the same question for practice wherever the problem has randomized values.

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1. 0/2 points  |  Previous Answers SzpECA1 2.4.04. My Notes
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0/2
 
The circuit element in the shaded box below is a three-terminal potentiometer, connected to a 9 V voltage source. The potentiometer consists of a single resistance of 500 Ω between its top and bottom terminals; the third (side) terminal is connected to a movable contact that slides along this resistance to divide it into two separate resistances R1 and R2 between the side terminal and the upper or lower terminals, respectively.
Suppose we wish to use this circuit to create an output voltage Vo that will vary between 1 V and 5 V as the sliding contact is moved. What minimum and maximum values of the resistance R1 should be selected to produce this result?
minimum R1 = Incorrect: Your answer is incorrect. Ω
maximum R1 = Incorrect: Your answer is incorrect. Ω
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2. –/2 points SzpECA1 4.2.01. My Notes
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The box in this figure contains an unknown network. When a load resistor of value RL = 220 Ω is connected across the output terminals of the box as shown, the voltage drop across it is measured to be VL = 105.6 V; but when RL = 370 Ω, the voltage drop across it is VL = 122.1 V.
Create a Thévenin equivalent of the network inside the box, by determining:
(a) the Thévenin voltage VT = V

(b) the Thévenin resistance RT = Ω
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3. 0/2 points  |  Previous Answers SzpECA1 5.1.02. My Notes
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0/2
 
This circuit is a simple model of a one-transistor amplifier, constructed from a bipolar-junction transistor wired in a common-emitter configuration.
Suppose the resistances are
RS = 5.8 kΩ, RB = 1 kΩ, RC = 1.4 kΩ,
and the current gain is β = 100.

(a) If the voltage source value is VS = 0.95 V, what is the value of the output voltage Vo?
Incorrect: Your answer is incorrect. V

(b) Graph the output voltage Vo as a function of the source voltage VS. Your graph should be a line segment over the domain of values for VS which keeps the output voltage in the range 0 ≤ Vo ≤ 15 V. (Round all voltages correctly to the nearest 0.1 V.)

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Incorrect: Your answer is incorrect.
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4. –/4 points SzpECA1 8.2.13. My Notes
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The switch in this circuit has been open for a very long time before being closed at time t = 0. Suppose VB = 14 V, C = 30 µF, and the resistance values are:
R1 = 44 kΩ, R2 = 26 kΩ, and R3 = 30 kΩ.
(a) What is the initial value of the voltage drop v across the capacitor at time t = 0?
V

(b) What is the final value of the voltage drop v across the capacitor at time t = ∞?
V

(c) What is the value of the time constant of this circuit for times t > 0?
s

(d) What is the voltage drop v(t) across this capacitor as a function of time, for times t > 0? (Here time t is in seconds.)

v(t) = V
Click here for help with symbolic formatting.
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5. –/4 points SzpECA1 10.2.03. My Notes
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–/4
 
In this circuit, iS(t) = 12 · cos(1900 · t) mA, and the components have values RS = 4.4 kΩ, R = 1.7 kΩ, L = 1.6 H, and C = 1 µF.
Determine the magnitude and phase angle of:
(a) the inductor current phasor IL
magnitude = mA
angle = rad

(b) the capacitor voltage phasor VC
magnitude = V
angle = rad
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