Question

1. If the 0.100
mm diameter tungsten filament in a light bulb is to have a
resistance of
0.177 Ω
at
20.0°C,
how long should it be? The resistivity of tungsten at
20.0°C
is
5.60 10^{-8}Ω
· m.

2. A power transmission line is hung from metal towers with
glass insulators having a resistance of 4.95 ✕ 109 Ω. What current
(in mA) flows through the insulator if the voltage is 220 kV? (Some
high-voltage lines are DC.)

Answer #1

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A light bulb has a diameter of 2.17x10-3m and an
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a.) If the light bulb has a resistance of 20.5 Ω at room
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filament? ______m
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(1)(A)What is the hot resistance of a 41.0 W light bulb with a
tungsten filament that runs on 120 V AC? If the bulb's operating
temperature is 2700°C, what is its resistance at 2620°C? The
temperature coefficient of resistivity of tungsten is 4.50
10-3 °C−1.
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A 60 W (110 V) light bulb has a tungsten filament of diameter
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(ii) 0.60 m
(ii) 2.2 m
(iii) 4.6 m
(iv) 1.1 m

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