Physics (10th Edition)

Published by Wiley
ISBN 10: 1118486897
ISBN 13: 978-1-11848-689-4

Chapter 20 - Electric Circuits - Check Your Understanding - Page 549: 7

Answer

(a) It decreases

Work Step by Step

Since temperature coefficient is positive so its resistance will increase with temperature, when tungsten will become hot its temperature will increase. We know that $ P= \frac{V^2}{R}$ so at constant voltage when resistance increases power will decrease.
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