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1. A group of dc motors is to operate at 220 volts at a place that is 400 ft away from 230-volt mains. What diameter (minimum) of copper wire is to be used in connecting the motors to the main, if the motors take a total of 75 A? a. 0.25 in b. 0.33 in c. 0.18 in

1. A group of dc motors is to operate at 220 volts at a place that is 400 ft away from 230-volt mains. What diameter (minimum) of copper wire is to be used in connecting the motors to the main, if the motors take a total of 75 A? a. 0.25 in b. 0.33 in c. 0.18 in

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...
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Lesson 3- Circuits 1 1. A group of dc motors is to operate at 220 volts at a place that is 400 it away from 230-volt mains. What diameter (minimum) of copper wire is to be used in connecting the motors to the main, if the motors take a total of 75 A? a. 0.25 in b. 0.33 in c. 0.18 in d. 0.45 in 2. An 8-Qresistance and resistor R. The entire circuit is connected across a 100-V source. If the voltage across resistor R is 20 V, find the value of R. a. 40 b. 6N c. 20 d. 80 3. Two resistors are wound with round copper wire. The length and cross sectional area of the second wire is 25% and 50% of the first wire. Determine the ratio of the power drawn by the first to the second resistors if they are connected across the same voltage source. a. 1/8 b. 1/4 c. 1/2 d. 1/16
Transcribed Image Text:Lesson 3- Circuits 1 1. A group of dc motors is to operate at 220 volts at a place that is 400 it away from 230-volt mains. What diameter (minimum) of copper wire is to be used in connecting the motors to the main, if the motors take a total of 75 A? a. 0.25 in b. 0.33 in c. 0.18 in d. 0.45 in 2. An 8-Qresistance and resistor R. The entire circuit is connected across a 100-V source. If the voltage across resistor R is 20 V, find the value of R. a. 40 b. 6N c. 20 d. 80 3. Two resistors are wound with round copper wire. The length and cross sectional area of the second wire is 25% and 50% of the first wire. Determine the ratio of the power drawn by the first to the second resistors if they are connected across the same voltage source. a. 1/8 b. 1/4 c. 1/2 d. 1/16
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