A voltmeter connected across the terminals of a tungsten-filament light bulb measures 117 V when an...
A voltmeter connected across the terminals of a tungsten-filament light bulb measures 117 V when an ammeter in line with the bulb registers a current of 0.641 A.
a) Find the resistance of the light bulb. (Enter your answer in ohms.)
b)
Find the resistivity of tungsten (in Ω · m) at the bulb's operating temperature if the filament has an uncoiled length of 0.593 m and a radius of 2.33 ✕ 10−5 m.
Homework Answers
Concepts:- here we use the Ohm's law to find the resistance and then we use dependence of resistance on resistivity, length and cross sectional area of wire to find the resistivity,
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