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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Concept explainers

Microscopic view of current

In physics, the term current is expressed as the rate of flow of electric charges across the area per unit time (I=q/t). It propagates along in the direction of the motion of positive charges. When the current is caused by the motion of electrons, the direction of the current is opposite to the flow.

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 $° C$

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.

Solution

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