Fundamentals of Electric Circuits
6th Edition
ISBN: 9780078028229
Author: Charles K Alexander, Matthew Sadiku
Publisher: McGraw-Hill Education
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Textbook Question
Chapter 1, Problem 26P
A cell phone battery is rated at 3.85 V and can store 10.78 watt-hours of energy.
- (a) How much average current can it deliver over a period of 3 hours if it is fully discharged at the end of that time?
- (b) How much average power is delivered in part (a)?
- (c) What is the ampere-hour rating of the battery?
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Q4. Figure Q4. shows a power system with one generator, two transformers, a line
and a load.
Zload=0.3+j0.102
G
Vgen-415/0°V
R = 0.02 2
tot
ZLine=1+j0.10
600 kVA
0.415/11 kV Y-Y
XT1=6%
tot
500 kVA
11/0.415 kV Y-Y
XT2=5%
Figure Q4. A Simple Power System
Q4. Figure Q4. shows a power system with one generator, two transformers, a line
and a load.
G
Vgen-415/0°V
от
R = 0.02
600 kVA
0.415/11 kV Y-Y
XT1=6%
ZLine=1+j0.1
tot
Zload=0.3+j0.102
500 kVA
11/0.415 kV Y-Y
XT2=5%
Figure Q4. A Simple Power System
a)
i.
ii.
The one-line diagram shown in Figure Q4. is a proposal for a new power
system. Assuming a base apparent power of 600 kVA and a base voltage
of 11 kV in the line section:
Calculate the Current magnitudes in the generator, line and load
sections
Calculate the overall system power factor
iii.
Obtain the system losses at rated operating conditions, and the potential
for series power factor correction, stating the value of the capacitor
necessary to bring the system power factor to unity.
b) A 230 V shunt DC motor is used for a check-out conveyer in a shop. The
motor has an armature resistance of 0.5 Q and a field resistance of 115 Q.
It draws a no-load current of 6 A and has a no-load speed of 1000 rev/min.
(i)
Draw the equivalent electrical circuit of the motor
(ii) When the supply current at a given load is 22 A, determine the motor
speed and motor efficiency.
c) Compare series and shunt DC motors in terms of their construction, torque-
speed characteristics, operational considerations to avoid possible risks
and applications.
Chapter 1 Solutions
Fundamentals of Electric Circuits
Ch. 1.3 - Calculate the amount of charge represented by...Ch. 1.3 - Prob. 2PPCh. 1.3 - The current flowing through an element is i= 4A...Ch. 1.5 - To move charge q from point b to point a requires...Ch. 1.5 - Find the power delivered to the element in Example...Ch. 1.5 - A home electric heater draws 10 A when connected...Ch. 1.6 - Figure 1.16 For Practice Prob. 1.7 Compute the...Ch. 1.7 - If an electron beam in a TV picture tube carries...Ch. 1.7 - Referring to the residential rate schedule in...Ch. 1 - One millivolt is one millionth of a volt. (a) True...
Ch. 1 - The prefix micro stands for: (a) 106 (b) 103 (c)...Ch. 1 - The voltage 2.000,000 V can be expressed in powers...Ch. 1 - A charge of 2 C flowing past a given point each...Ch. 1 - The unit of current is: (a) coulomb (b) ampere (c)...Ch. 1 - Voltage is measured in: (a) watts (b) amperes (c)...Ch. 1 - Prob. 7RQCh. 1 - The voltage across a 1.1-kW toaster that produces...Ch. 1 - Which of these is not an electrical quantity? (a)...Ch. 1 - The dependent source in Fig. 1.22 is: (a)...Ch. 1 - How much charge is represented by these number of...Ch. 1 - Determine the current flowing through an element...Ch. 1 - Find the charge q(t) flowing through a device if...Ch. 1 - A total charge of 300 C flows past a given cross...Ch. 1 - Prob. 5PCh. 1 - The charge entering a certain element is shown in...Ch. 1 - The charge flowing in a wire is plotted in Fig....Ch. 1 - Prob. 8PCh. 1 - The current through an element is shown in (a) t =...Ch. 1 - A lightning bolt with 10 kA strikes an object for...Ch. 1 - A rechargeable flashlight battery is capable of...Ch. 1 - The charge entering the positive terminal of an...Ch. 1 - The voltage v(t) across a device and the current...Ch. 1 - The current entering the positive terminal of a...Ch. 1 - Prob. 16PCh. 1 - Figure 1.28 shows a circuit with four elements, p1...Ch. 1 - Find the power absorbed by each of the elements in...Ch. 1 - Find I and the power absorbed by each element in...Ch. 1 - Find Vo and the power absorbed by each element in...Ch. 1 - A 60-W incandescent bulb operates at 120 V. How...Ch. 1 - Prob. 22PCh. 1 - A 1.8-kW electric heater takes 15 min to boil a...Ch. 1 - A utility company charges 8.2 cents/kWh. If a...Ch. 1 - A 1.2-kW toaster takes roughly 4 minutes to heat...Ch. 1 - A cell phone battery is rated at 3.85 V and can...Ch. 1 - A constant current of 3 A for 4 hours is required...Ch. 1 - A 150-W incandescent outdoor lamp is connected to...Ch. 1 - An electric stove with four burners and an oven is...Ch. 1 - Reliant Energy (the electric company in Houston,...Ch. 1 - In a household, a business is run for an average...Ch. 1 - A telephone wire has a current of 20 A flowing...Ch. 1 - A lightning bolt carried a current of 2 kA and...Ch. 1 - Figure 1.32 shows the power consumption of a...Ch. 1 - The graph in Fig. 1.33 represents the power drawn...Ch. 1 - A battery can be rated in ampere-hours (Ah) or...Ch. 1 - A total of 2 MJ are delivered to an automobile...Ch. 1 - How much energy does a 10-hp motor deliver in 30...Ch. 1 - A 600-W TV receiver is turned on for 4 h with...
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