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Electricity 1: Devices, Circuits and Materials

Thomas Kubala

Chapter 10

SUMMARY REVIEW OF UNITS 1–9 - all with Video Answers

Educators

Chapter Questions

Problem 1

In items 1 through 10, insert the word or phrase that will make each incomplete statement true.
Electrical pressure is measured in _____________________________________.

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Problem 2

In items 1 through 10, insert the word or phrase that will make each incomplete statement true.
Electrical current is measured in ______________________________________.

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01:42

Problem 3

In items 1 through 10, insert the word or phrase that will make each incomplete statement true.
The symbol for resistance is the Greek letter ____________________________.

Carson Merrill
Carson Merrill
Numerade Educator
01:01

Problem 4

In items 1 through 10, insert the word or phrase that will make each incomplete statement true.
An electrical current is the movement of ________________________________.

Narayan Hari
Narayan Hari
Numerade Educator

Problem 5

In items 1 through 10, insert the word or phrase that will make each incomplete statement true.
The symbol for source voltage is the letter_______________________________.

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Problem 6

In items 1 through 10, insert the word or phrase that will make each incomplete statement true.
Resistance is measured in ____________________________________________.

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Problem 7

In items 1 through 10, insert the word or phrase that will make each incomplete statement true.
The symbol for current is the letter_____________________________________.

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Problem 8

In items 1 through 10, insert the word or phrase that will make each incomplete statement true.
Electrical power is measured in _______________________________________.

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Problem 9

In items 1 through 10, insert the word or phrase that will make each incomplete statement true.
The symbol for electrical power is the letter _____________________________.

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Problem 10

In items 1 through 10, insert the word or phrase that will make each incomplete statement true.
Electrical energy is measured in _______________________________________.

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Problem 11

For each of the incomplete statements at the left in items 11 through 20, select the best word or phrase from the right to make each statement true. Place the letter of the word or phrase in the space provided.
a. copper.
b. circular mils.
c. power.
d. specific gravity.
e. an ohmmeter.
f. length.
g. CSA.
h. parallel.
i. series.
j. mils.
k. energy.
l. gold.
m. silver.
n. a voltmeter.
o. a watt-hour meter.
p. series-parallel.
q. voltage.
r. mil-feet.
s. current.
The resistance of a conductor varies directly with its_________

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Problem 12

For each of the incomplete statements at the left in items 11 through 20, select the best word or phrase from the right to make each statement true. Place the letter of the word or phrase in the space provided.
a. copper.
b. circular mils.
c. power.
d. specific gravity.
e. an ohmmeter.
f. length.
g. CSA.
h. parallel.
i. series.
j. mils.
k. energy.
l. gold.
m. silver.
n. a voltmeter.
o. a watt-hour meter.
p. series-parallel.
q. voltage.
r. mil-feet.
s. current.
Energy per unit time is _________

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Problem 13

For each of the incomplete statements at the left in items 11 through 20, select the best word or phrase from the right to make each statement true. Place the letter of the word or phrase in the space provided.
a. copper.
b. circular mils.
c. power.
d. specific gravity.
e. an ohmmeter.
f. length.
g. CSA.
h. parallel.
i. series.
j. mils.
k. energy.
l. gold.
m. silver.
n. a voltmeter.
o. a watt-hour meter.
p. series-parallel.
q. voltage.
r. mil-feet.
s. current.
The CSA of wire is usually expressed in_________

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Problem 14

For each of the incomplete statements at the left in items 11 through 20, select the best word or phrase from the right to make each statement true. Place the letter of the word or phrase in the space provided.
a. copper.
b. circular mils.
c. power.
d. specific gravity.
e. an ohmmeter.
f. length.
g. CSA.
h. parallel.
i. series.
j. mils.
k. energy.
l. gold.
m. silver.
n. a voltmeter.
o. a watt-hour meter.
p. series-parallel.
q. voltage.
r. mil-feet.
s. current.
The resistance of a wire varies inversely with its_________

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Problem 15

For each of the incomplete statements at the left in items 11 through 20, select the best word or phrase from the right to make each statement true. Place the letter of the word or phrase in the space provided.
a. copper.
b. circular mils.
c. power.
d. specific gravity.
e. an ohmmeter.
f. length.
g. CSA.
h. parallel.
i. series.
j. mils.
k. energy.
l. gold.
m. silver.
n. a voltmeter.
o. a watt-hour meter.
p. series-parallel.
q. voltage.
r. mil-feet.
s. current.
The most frequently used conductor of electricity is_________

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Problem 16

For each of the incomplete statements at the left in items 11 through 20, select the best word or phrase from the right to make each statement true. Place the letter of the word or phrase in the space provided.
a. copper.
b. circular mils.
c. power.
d. specific gravity.
e. an ohmmeter.
f. length.
g. CSA.
h. parallel.
i. series.
j. mils.
k. energy.
l. gold.
m. silver.
n. a voltmeter.
o. a watt-hour meter.
p. series-parallel.
q. voltage.
r. mil-feet.
s. current.
In wire size tables, the diameter of a wire is expressed in_________

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Problem 17

For each of the incomplete statements at the left in items 11 through 20, select the best word or phrase from the right to make each statement true. Place the letter of the word or phrase in the space provided.
a. copper.
b. circular mils.
c. power.
d. specific gravity.
e. an ohmmeter.
f. length.
g. CSA.
h. parallel.
i. series.
j. mils.
k. energy.
l. gold.
m. silver.
n. a voltmeter.
o. a watt-hour meter.
p. series-parallel.
q. voltage.
r. mil-feet.
s. current.
A parallel circuit has more than one path for _________

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Problem 18

For each of the incomplete statements at the left in items 11 through 20, select the best word or phrase from the right to make each statement true. Place the letter of the word or phrase in the space provided.
a. copper.
b. circular mils.
c. power.
d. specific gravity.
e. an ohmmeter.
f. length.
g. CSA.
h. parallel.
i. series.
j. mils.
k. energy.
l. gold.
m. silver.
n. a voltmeter.
o. a watt-hour meter.
p. series-parallel.
q. voltage.
r. mil-feet.
s. current.
Electrical resistance is measured with an instrument known as_________

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Problem 19

For each of the incomplete statements at the left in items 11 through 20, select the best word or phrase from the right to make each statement true. Place the letter of the word or phrase in the space provided.
a. copper.
b. circular mils.
c. power.
d. specific gravity.
e. an ohmmeter.
f. length.
g. CSA.
h. parallel.
i. series.
j. mils.
k. energy.
l. gold.
m. silver.
n. a voltmeter.
o. a watt-hour meter.
p. series-parallel.
q. voltage.
r. mil-feet.
s. current.
Higher voltage is obtained by connecting batteries in_________

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Problem 20

For each of the incomplete statements at the left in items 11 through 20, select the best word or phrase from the right to make each statement true. Place the letter of the word or phrase in the space provided.
a. copper.
b. circular mils.
c. power.
d. specific gravity.
e. an ohmmeter.
f. length.
g. CSA.
h. parallel.
i. series.
j. mils.
k. energy.
l. gold.
m. silver.
n. a voltmeter.
o. a watt-hour meter.
p. series-parallel.
q. voltage.
r. mil-feet.
s. current.
In charging a battery, it should be kept on charge until there is no further increase in_________

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04:01

Problem 21

Select the best answer to make statements 21 through 52 true, and place the corresponding letter in the space provided.
To operate properly, electrical components connected in a series circuit must have the same rating with respect to (a) voltage (b) current (c) resistance (d) power (e) insulation._________

Vishal Gupta
Vishal Gupta
Numerade Educator
04:01

Problem 22

Select the best answer to make statements 21 through 52 true, and place the corresponding letter in the space provided.
To operate properly, electrical components in a parallel circuit must have the same rating with respect to (a) voltage (b) current (c) resistance (d) power (e) energy._________

Vishal Gupta
Vishal Gupta
Numerade Educator
01:34

Problem 23

Select the best answer to make statements 21 through 52 true, and place the corresponding letter in the space provided.
The major part of the resistance in a correctly wired electrical circuit is usually found in the (a) connecting wires (b) components in a circuit (c) power supply (d) measuring instruments (e) closed switches._________

Brian Francisco
Brian Francisco
Numerade Educator
04:48

Problem 24

Select the best answer to make statements 21 through 52 true, and place the corresponding letter in the space provided.
Refer to Figure $10-1$ for problems 24 through 30
FIGURE CANT COPY
Figure 10-1 Summary review circuit.
Figure 10-1 is a (a) series circuit (b) parallel circuit (c) seriesparallel circuit (d) shunt circuit (e) reciprocal circuit.._________

Sikandar Baig
Sikandar Baig
Numerade Educator
03:28

Problem 25

Select the best answer to make statements 21 through 52 true, and place the corresponding letter in the space provided.
Refer to Figure $10-1$ for problems 24 through 30
FIGURE CANT COPY
Figure 10-1 Summary review circuit.
The resistance of branch A-B is (a) $2.5 \mathrm{ohms}$ (b) $5 \mathrm{ohms}$._________
(c) 20 ohms
(d) 0 ohms
(e) infinity.

Prem Bijarniya
Prem Bijarniya
Numerade Educator
00:29

Problem 26

Select the best answer to make statements 21 through 52 true, and place the corresponding letter in the space provided.
Refer to Figure $10-1$ for problems 24 through 30
FIGURE CANT COPY
Figure 10-1 Summary review circuit.
If an ohmmeter is connected across $R_1$, it will read (a) $2.5 \mathrm{ohms}$ (b) 5 ohms (c) 7.5 ohms (d) 10 ohms (e) less than 2.5 ohms. (Note: Consider the entire circuit, not just $\mathrm{R}_1$.)._________

Brian Francisco
Brian Francisco
Numerade Educator
01:47

Problem 27

Select the best answer to make statements 21 through 52 true, and place the corresponding letter in the space provided.
Refer to Figure $10-1$ for problems 24 through 30
FIGURE CANT COPY
Figure 10-1 Summary review circuit.
If $R_1$ suddenly develops a "short" (zero resistance), the total resistance across points $\mathrm{X}$ and $\mathrm{Y}$ will (a) increase (b) decrease (c) remain constant (d) equal 2.5 ohms.._________

Vishal Gupta
Vishal Gupta
Numerade Educator
01:47

Problem 28

Select the best answer to make statements 21 through 52 true, and place the corresponding letter in the space provided.
Refer to Figure $10-1$ for problems 24 through 30
FIGURE CANT COPY
Figure 10-1 Summary review circuit.
If $R_1$ develops an "open," the resistance of branch C-D will (a) increase (b) decrease (c) remain constant (d) change to zero.._________

Vishal Gupta
Vishal Gupta
Numerade Educator
09:28

Problem 29

Select the best answer to make statements 21 through 52 true, and place the corresponding letter in the space provided.
Refer to Figure $10-1$ for problems 24 through 30
FIGURE CANT COPY
Figure 10-1 Summary review circuit.
An ohmmeter is connected across points $\mathrm{X}$ and $\mathrm{Y}$. It has a reading of infinity. This indicates that (a) one resistor is open (b) $R_1$ or $R_2$ is open (c) $R_3$ or $R_4$ is open (d) one resistor in each branch is open (e) $R_1$ and $R_2$ are both open.._________

Abhishek Jana
Abhishek Jana
Numerade Educator
09:28

Problem 30

Select the best answer to make statements 21 through 52 true, and place the corresponding letter in the space provided.
Refer to Figure $10-1$ for problems 24 through 30
FIGURE CANT COPY
Figure 10-1 Summary review circuit.
An ohmmeter connected across points $\mathrm{X}$ and $\mathrm{Y}$ has a reading of zero. This indicates that (a) $R_1$ and $R_2$ are shorted out (zero resistance) (b) one resistor in each branch is shorted out (c) $R_2$ and $R_4$ are shorted out (d) $R_1$ is shorted and $R_4$ is open.._________

Abhishek Jana
Abhishek Jana
Numerade Educator
03:44

Problem 31

Refer to Figure $10-2$ for problems 31 through 35 .
FIGURE CANT COPY
Figure 10-2 Summary review circuit.
The voltage across $R_3$ is (a) 2 volts (b) 4 volts (c) 5 volts (d) 8 volts (e) 10 volts._________

Vishal Gupta
Vishal Gupta
Numerade Educator
00:29

Problem 32

Refer to Figure $10-2$ for problems 31 through 35 .
FIGURE CANT COPY
Figure 10-2 Summary review circuit.
The current through $R_2$ is (a) 1 ampere (b) 2 amperes (c) 4 amperes (d) 8 amperes (e) 16 amperes._________

Brian Francisco
Brian Francisco
Numerade Educator
00:29

Problem 33

Refer to Figure $10-2$ for problems 31 through 35 .
FIGURE CANT COPY
Figure 10-2 Summary review circuit.
The total current in the circuit is (a) 4 amperes (b) 10 amperes (c) 15 amperes (d) 20 amperes (e) 25 amperes._________

Brian Francisco
Brian Francisco
Numerade Educator
02:58

Problem 34

Refer to Figure $10-2$ for problems 31 through 35 .
FIGURE CANT COPY
Figure 10-2 Summary review circuit.
If a voltmeter connected across $R_1$ has a reading of 20 volts, it means that (a) $R_1$ is open (b) $R_3$ is shorted (c) $R_1$ is shorted (d) $R_2$ is open (e) $R_2$ and $R_4$ must be open._________

Vishal Gupta
Vishal Gupta
Numerade Educator
06:14

Problem 35

Refer to Figure $10-2$ for problems 31 through 35 .
FIGURE CANT COPY
Figure 10-2 Summary review circuit.
A voltmeter connected across $R_2$ has a reading of zero. This means that (a) $R_1$ is shorted (b) $R_2$ is shorted (c) $R_3$ is open (d) $R_2$ is open (e) no conclusion is possible._________

Ben Nicholson
Ben Nicholson
Numerade Educator
01:09

Problem 36

In Figure 10-3, the total circuit resistance is (a) $1 / 4 \mathrm{ohm}$ (b) 1 ohm (c) 4 ohms (d) 8 ohms (e) 16 ohms._________
FIGURE CANT COPY
Figure 10-3 Summary review circuit.

Averell Hause
Averell Hause
Carnegie Mellon University
01:44

Problem 37

In Figure 10-4, the total resistance across points $A$ and $B$ is (a) 5 ohms (b) 10 ohms (c) 15 ohms (d) 20 ohms (e) 25 ohms (f) not obtainable._________
FIGURE CANT COPY
Figure 10-4 Summary review circuit.

Prem Bijarniya
Prem Bijarniya
Numerade Educator
02:55

Problem 38

A 40-volt power supply is connected across points A and B of Figure 10-4. The current through one of the 10 -ohm resistors is_________
(a) 1.6 amperes
(b) 2 amperes
(c) 4 amperes
(d) 8 amperes
(e) 16 amperes.

Rachel B.
Rachel B.
Numerade Educator
04:27

Problem 39

With respect to one another, the three lamps in Figure 10-5 are connected in (a) series (b) parallel (c) shunt (d) series-parallel (e) a Norton circuit.____

Yaqub Khan
Yaqub Khan
Numerade Educator
00:49

Problem 40

In Figure 10-5, the voltmeter is (a) in series with the lamps____
(b) in parallel with the lamps (c) in series with the battery
(d) in parallel with the ammeter (e) in parallel with the center lamp.
FIGURE CANT COPY
Figure 10-5 Summary review circuit.

Mirza Aslam Beig
Mirza Aslam Beig
Numerade Educator
00:49

Problem 41

The ammeter in Figure 10-5 is (a) in series with the battery
(b) in parallel with the battery (c) in parallel with the voltmeter
(d) in parallel with the lamps (e) in a short circuit.

Mirza Aslam Beig
Mirza Aslam Beig
Numerade Educator
05:07

Problem 42

Four lamps, with equal resistance values, are connected in parallel to a 120 -volt DC power supply. The voltage across each lamp is (a) 2.5 volts (b) 25 volts (c) 120 volts (d) 400 volts (e) not obtainable.

Abhishek Jana
Abhishek Jana
Numerade Educator
05:07

Problem 43

Five lamps, with equal resistance values, are connected in series to a 125 -volt source. The voltage across each lamp is (a) 5 volts (b) 25 volts (c) 125 volts (d) 625 volts (e) not obtainable.

Abhishek Jana
Abhishek Jana
Numerade Educator
04:35

Problem 44

Five resistors of equal value are connected in parallel to a 125 -volt DC supply. If the total current is 5 amperes, the current through one of the resistors is (a) 1 ampere (b) 5 amperes
(c) 10 amperes
(d) 15 amperes
(e) 25 amperes.

Sri Datta Vikas Buchemmavari
Sri Datta Vikas Buchemmavari
Numerade Educator
09:29

Problem 45

Four lamps with unequal resistance values are connected in series to a 117-volt supply. If the total source current is 8 amperes, the current through one of the lamps is (a) 2 amperes (b) 4 amperes (c) 8 amperes
(d) 16 amperes
(e) 32 amperes.

Vishal Gupta
Vishal Gupta
Numerade Educator
01:21

Problem 46

The words "state of charge" refer to (a) the specific gravity of the battery (b) the combined voltage of all cells (c) the number of ampere-hours available for discharge (d) the ampere-hour rating of the battery (e) the voltage rating of the battery.

Morgan Sizemore
Morgan Sizemore
Numerade Educator
02:11

Problem 47

The term "charging rate" refers to the (a) cost of charging the battery (b) number of hours needed to charge the battery (c) the charging current (d) the voltage of the charging source (e) cost of the battery charger.

Manish Kumar ( Iit K )
Manish Kumar ( Iit K )
Numerade Educator
01:21

Problem 48

A large storage cell, as compared to a small one, has a (a) higher voltage (b) longer life (c) higher ampere-hour rating (d) lower freezing point (e) higher internal resistance.

Morgan Sizemore
Morgan Sizemore
Numerade Educator
01:32

Problem 49

A battery may be charged at a high charging rate if the (a) rate is kept under 150 amperes (b) charging time is below 3 hours (c) voltage does not exceed 7.5 volts (d) electrolyte temperature is kept under $110^{\circ} \mathrm{F}$ (e) water level is proper.

Penny Riley
Penny Riley
Numerade Educator
02:27

Problem 50

A storage battery should be charged until (a) the voltage reaches 6 volts (b) the cells begin to gas (c) the specific gravity reaches 1,300 (d) the temperature reaches $110^{\circ} \mathrm{F}$ (e) the specific gravity reading stops rising.

Himanshu Kushwaha
Himanshu Kushwaha
Numerade Educator
04:20

Problem 51

A battery rated at 120 ampere-hours will deliver a current of 5 amperes for approximately (a) 5 hours (b) 12 hours (c) 24 hours (d) 120 hours (e) 600 hours.

Shoukat Ali
Shoukat Ali
Other Schools
01:32

Problem 52

The outstanding danger of allowing a battery to remain in a state of discharge is that it will (a) result in a permanent reduction in the ampere-hour capacity (b) require a long time to recharge (c) gas violently when charged (d) become damaged at low temperatures or very high altitudes (e) not come up to full current on charge.

Penny Riley
Penny Riley
Numerade Educator
00:30

Problem 53

What is the resistance of a toaster that draws 10 amperes when connected to a 120 -volt circuit?

Averell Hause
Averell Hause
Carnegie Mellon University
04:44

Problem 54

Determine the resistance of 1,500 feet of copper wire that has a diameter of approximately 129 mils $(K=12.6)$.

Vishal Gupta
Vishal Gupta
Numerade Educator
01:23

Problem 55

Find the total resistance of 2,500 feet of No. 4 copper wire at $167^{\circ} \mathrm{F}$ if the wire resistance per thousand feet is $0.308 \mathrm{ohm}$ at this temperature.

Prabhu Ramji
Prabhu Ramji
Numerade Educator
04:08

Problem 56

Two resistors connected in parallel have a combined resistance of 12 ohms. One of them is a 48 -ohm resistor. What is the resistance of the other resistor?

Ben Nicholson
Ben Nicholson
Numerade Educator
01:44

Problem 57

A 4-ohm, an 8-ohm, and a 12-ohm resistor are connected in series. The voltage across the 8 -ohm resistor is 80 volts. Determine the supply voltage.

Prabhu Ramji
Prabhu Ramji
Numerade Educator
04:19

Problem 58

Calculate the overall efficiency of a DC motor that draws 40 amperes from a 115-volt source, and delivers $5 \mathrm{hp}$ to a load.

Ghazala Khan
Ghazala Khan
Numerade Educator
04:16

Problem 59

Determine the proper size conductors for a 500 -watt load that is located 100 feet from a 250 -volt panelboard. The permissible line drop is 2 volts and $\mathrm{K}=12.6$.

Jayashree Behera
Jayashree Behera
Numerade Educator
03:03

Problem 60

Find the voltage that exists at the load in problem 59.

Narayan Hari
Narayan Hari
Numerade Educator
01:25

Problem 61

Determine the power taken by $R_2$ in Figure 10-6.

Prabhu Ramji
Prabhu Ramji
Numerade Educator

Problem 62

Find the power at $\mathrm{R}_4$ in Figure 10-7.

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