College Physics (7th Edition)

Published by Pearson
ISBN 10: 0-32160-183-1
ISBN 13: 978-0-32160-183-4

Chapter 5 - Work and Energy - Learning Path Questions and Exercises - Conceptual Questions - Page 174: 19

Answer

a). No. Efficiency only describes what part of input energy is converted to output energy or any other form of energy. b). Not necessarily. If given power is net power, then it has considered factors in efficiency. However, one could run a less powerful machine longer to do more work. But if given power is not net power, one has to take efficiency into consideration. If 2 machines with same rated gross power have different efficiencies, the more efficient machine will do more work.

Work Step by Step

a). No. Efficiency only describes what part of input energy is converted to output energy or any other form of energy. b). Not necessarily. If given power is net power, then it has considered factors in efficiency. However, one could run a less powerful machine longer to do more work. But if given power is not net power, one has to take efficiency into consideration. If 2 machines with same rated gross power have different efficiencies, the more efficient machine will do more work.
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