Essential University Physics: Volume 1 (4th Edition) Clone

Published by Pearson
ISBN 10: 0-134-98855-8
ISBN 13: 978-0-13498-855-9

Chapter 19 - Section 19.4 - Entropy and Energy Quality - Conceptual Example - Page 354: 19.1

Answer

The gas heater is better.

Work Step by Step

Even though the electric heater is 100% efficient in your house, you must trace the electricity back to its original source. After all, electricity is often made using fossil fuels, and the production of electricity is usually not completely efficient. Therefore, the 85% efficiency of the gas heat, even though it appears to be less than the electric heater, is actually a greater efficiency, for the efficiency of power plants producing electricity is generally below 85%.
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