A 40 WW (120 VV) lightbulb has a tungsten filament of diameter 0.040 mmmm . The filament's operating temperature is 1500∘C∘C. How long is the filament? Express your answer with the appropriate units.
A 40 WW (120 VV) lightbulb has a tungsten filament of diameter 0.040 mmmm . The filament's operating temperature is 1500∘C∘C. How long is the filament? Express your answer with the appropriate units.
Principles of Physics: A Calculus-Based Text
5th Edition
ISBN:9781133104261
Author:Raymond A. Serway, John W. Jewett
Publisher:Raymond A. Serway, John W. Jewett
Chapter21: Current And Direct Current Circuits
Section: Chapter Questions
Problem 17P
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Question
A 40 WW (120 VV) lightbulb has a tungsten filament of diameter 0.040 mmmm . The filament's operating temperature is 1500∘C∘C.
How long is the filament?
Express your answer with the appropriate units.
Expert Solution
Step 1
According to the given daTa
V=120 volt
P=40 watt
T=1500
D=0.04mm
We need to find
Length of the filament
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Follow-up Question
What is the resistance of the filament at 20∘C∘C ?
Express your answer with the appropriate units.
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