Programmed Review for Electrical Engineering, Third Edition
This text contains an organized review of the basic electrical engineering fundamentals, with 111 problems, solutions and explanations for the core electrical engineering concepts.
TABLE OF CONTENTS Programmed Review for Electrical Engineering, Third Edition
Work, Energy, and Power
The problem in this section illustrates the application of three fundamental engineering parameters.
Problem 2-2: WORK, ENERGY, AND POWER
Q:
A hoist driven by a three-phase electric motor has a 4000-pound load capacity.
How much energy in joules and power in KW is required to raise a full capacity load 100 feet in one minute?
What motor capacity in HP is required to drive the hoist if the hoisting machinery is only 75% efficient?
Answers
Q:
1 watt-second = 1 joule = 0.738 lb-ft
(answer)
(answer)
= 9033 W or 9.033 KW
(answer)
If your answers are correct, go on to Problem 2-3.
If your answers are not correct, review p. 3.
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