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Electricity 1: Devices, Circuits and Materials

Thomas Kubala

Chapter 9

VOLTAGE DROP ACROSS CONDUCTORS - all with Video Answers

Educators

Chapter Questions

00:25

Problem 1

If the current in Figure 9-1 changes to 35 amperes, find the voltage applied to the motor.
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Chinmai Managoli
Chinmai Managoli
Numerade Educator
02:27

Problem 2

Find the line drop in Figure 9-1 if the total length of the wire is 812 feet instead of 584 feet.
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Sarah Wharton
Sarah Wharton
Numerade Educator

Problem 3

If the wire in Figure 9-1 is changed so that its resistance is 0.4 ohm per thousand feet, with 584 feet required, find the voltage applied to the motor.
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02:51

Problem 4

A DC motor draws 100 amperes at full load from a 220-volt DC source 200 feet away. If a 3 percent line voltage loss is permissible, find the wire size to be used for the line conductors. K = 12.9.
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Ceren Uzun
Ceren Uzun
Texas Tech University
00:25

Problem 5

In problem 4, what is the voltage across the motor? ________________________
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Chinmai Managoli
Chinmai Managoli
Numerade Educator
01:42

Problem 6

A 110-volt DC source supplies 25 amperes to a load circuit 500 feet away. No. 10 copper wires are used for line conductors. K = 12.6. Find
a. the line drop. b. the voltage at the load.
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Ze-Han Lee
Ze-Han Lee
Numerade Educator

Problem 7

If the circuit in problem 6 uses No. 8 copper wires, find the voltage at the load. K = 12.6.
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02:46

Problem 8

Determine the proper size of copper conductors necessary to supply a parallel group of five 300-watt lamps that are located 75 feet from a panelboard. The voltage at the panelboard is 120 volts. Permissible line drop is 1.2 volts. K = 12.6.
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Eric Mockensturm
Eric Mockensturm
Numerade Educator

Problem 9

If the distance in problem 8 changes to 225 feet, determine the size of the conductors.
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03:34

Problem 10

The voltage source across a motor is 238 volts. The motor is located 200 feet from the source voltage. The type of wire used is an alloy, and the CSA is unknown. If the line drop equals 2 volts, find the value of the source voltage.
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Narayan Hari
Narayan Hari
Numerade Educator
02:07

Problem 11

In items 11 through 16, select the best answer that makes each item a true statement. Place the letter of the answer in the space provided.
The annoying effect of dimming lights in a home sometimes occurs when a device is connected to the line and it has a value of resistance that is __________
a. high.
b. low.
c. medium.
d. higher than the resistance of other devices on the line.
e. equal to the resistance of other devices on the line.

Brian Francisco
Brian Francisco
Numerade Educator
01:07

Problem 12

In items 11 through 16, select the best answer that makes each item a true statement. Place the letter of the answer in the space provided.
For a small line voltage drop, the resistance of line conductors should be __________
a. a small percentage of the total circuit resistance.
b. a large percentage of the total circuit resistance.
c. equal to the load resistance.
d. equal to the combination of load resistance and source resistance.
e. equal to the source resistance.

Sanchit Jain
Sanchit Jain
Numerade Educator
00:42

Problem 13

In items 11 through 16, select the best answer that makes each item a true statement. Place the letter of the answer in the space provided.
When a permitted percentage of line voltage drop is specified in a problem, the value is computed directly from the __________
a. load voltage.
b. source voltage.
c. voltage across control components.
d. voltage across components that make up the load resistance.
e. wire tables.

Jayashree Behera
Jayashree Behera
Numerade Educator
01:16

Problem 14

In items 11 through 16, select the best answer that makes each item a true statement. Place the letter of the answer in the space provided.
The voltage that is applied to a load is equal to __________
a. the source voltage.
b. the line voltage drop minus the source voltage.
c. the line voltage.
d. the line voltage drop.
e. the source voltage minus the line voltage drop.

Sanu Kumar
Sanu Kumar
Numerade Educator

Problem 15

In items 11 through 16, select the best answer that makes each item a true statement. Place the letter of the answer in the space provided.
Line voltage drop is inversely proportional to the __________
a. length of the circuit.
b. current through the load.
c. CSA of the conductor.
d. current-carrying capacity of the conductor.
e. current through the conductor.

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Problem 16

In items 11 through 16, select the best answer that makes each item a true statement. Place the letter of the answer in the space provided.
Two important general factors that must be considered when selecting conductors are permissible voltage drop and __________
a. CSA.
b. cost.
c. resistance.
d. the load components.
e. whether the conductors should be silver or copper.

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