Essential University Physics: Volume 1 (3rd Edition)

Published by Pearson
ISBN 10: 0321993721
ISBN 13: 978-0-32199-372-4

Chapter 19 - For Thought and Discussion: 6

Answer

They are incorrect.

Work Step by Step

Electric heat is not 100% efficient. Just in the process of carrying energy from one place to another, energy is lost due to internal resistance of the wire. Furthermore, since not all of the energy goes to heating your house, the process is not 100 percent efficient.
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