7. A 100 W incandescent lamp has a resistance when cold (lamp extinguished) that is only 1/12 of its hot (lamp illuminated) resistance value. a) What is the lamp current and its hot resistance when placed across a 120 V line? b) What is the cold resistance of this lamp? c) What is the instantaneous current through the lamp at the moment it is switched on? d) What power does the lamp dissipate at this instant?

7. A 100 W incandescent lamp has a resistance when cold (lamp extinguished) that is only 1/12 of its hot (lamp illuminated) resistance value. a) What is the lamp current and its hot resistance when placed across a 120 V line? b) What is the cold resistance of this lamp? c) What is the instantaneous current through the lamp at the moment it is switched on? d) What power does the lamp dissipate at this instant?

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

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