Answered: In the Bat Cave, Alfred is performing…

University Physics Volume 2

18th Edition

ISBN:9781938168161

Author:OpenStax

Publisher:OpenStax

Chapter10: Direct-current Circuits

Section: Chapter Questions

Problem 25P: A 12.0-V emf automobile battery has a terminal voltage of 16.0 V when being charged by a current of...

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In the Bat Cave, Alfred is performing some maintenance on some mood lighting. He installs an incandescent bulb with tungsten filament that has a diameter of 2.30x10-5m and an UNKNOWN length. a) If the light bulb has a resistance of 30.0Ω at 20.0°C, then what is the length of the filament? b) At room temperature a current of 5.20A flows through the filament. What is the power dissipated by the filament? c) If the voltage that flows through the filament is constant then what will be the temperature of the filament when the bulb reaches a power output of 75.0W? (The resistivity of tungsten is 5.60x10-8Ωm and the temperature coefficient of resistivity is 4.50x10-3 (°C)-1)

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