   Chapter 17, Problem 11P

Chapter
Section
Textbook Problem

A voltmeter connected across the terminals of a tungsten-filament light bulb measures 115 V when an ammeter in line with the bulb registers a current of 0.522 A. (a) Find the resistance of the light bulb, (b) Find the resistivity of tungsten at the bulb’s operating temperature if the filament has an uncoiled length of 0.600 m and a radius of 2.30 × 10−5 m.

(a)

To determine
The resistance of the light bulb.

Explanation

Given Info: The voltmeter measured 115V and ammeter measured 0.522A for the bulb with tungsten filament.

Explanation:

R=ΔVI

• ΔV is the operating voltage,
• I is the electric current,
• R is the resistance of the tungsten filament,

Substitute 0

(b)

To determine
The resistivity of the light bulb.

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