College Physics

11th Edition
Raymond A. Serway + 1 other
ISBN: 9781305952300



College Physics

11th Edition
Raymond A. Serway + 1 other
ISBN: 9781305952300
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.


To determine
The resistance of the light bulb.


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



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

Substitute 0


To determine
The resistivity of the light bulb.

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