The filament of a 100-W bulb carries a current of 0.83 A at the normal operating voltage of 120 V.A. What is the resistance of the filament?B. If the filament is made of tungsten wire of diameter 0.035 mm, how long is the filament? TABLE 22.1 Resistivity of materialsResistivity(N• m)MaterialCopperTungsten (20°C)Tungsten (1500°C)1.7 × 10-85.6 × 1085.0 x 10-7Iron9.7 x 10-8Nichrome1.5 × 106Seawater0.22Blood (average)1.6Muscle13FatPure waterCell membrane252.4 x 103.6 × 107e on

Write the given values of the problem- Power(P) P= 100 W Current(I) I=0.83 A Voltage(V) V=120 V…

e filament of a 100-W bulb carries a current of 0.83 A at the normal operating voltage of 120 V. A. What is the resistance of the filament? B. If the filament is made of tungsten wire of diameter 0.035 mm, how long is the filament?

e filament of a 100-W bulb carries a current of 0.83 A at the normal operating voltage of 120 V. A. What is the resistance of the filament? B. If the filament is made of tungsten wire of diameter 0.035 mm, how long is the filament?

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 14P

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Question

The filament of a 100-W bulb carries a current of 0.83 A at the normal operating voltage of 120 V.

A. What is the resistance of the filament?

B. If the filament is made of tungsten wire of diameter 0.035 mm, how long is the filament?

TABLE 22.1 Resistivity of materials
Resistivity
(N• m)
Material
Copper
Tungsten (20°C)
Tungsten (1500°C)
1.7 × 10-8
5.6 × 108
5.0 x 10-7
Iron
9.7 x 10-8
Nichrome
1.5 × 106
Seawater
0.22
Blood (average)
1.6
Muscle
13
Fat
Pure water
Cell membrane
25
2.4 x 10
3.6 × 107
e on

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