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A certain lightbulb is rated at 60.0 W when operating at an rms voltage of 120 V. (a) What is the peak voltage applied across the bulb? (b) What is the resistance of the bulb? (c) Does a 100-W bulb have greater or less resistance than a 60.0-W bulb? Explain. 

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Rochelle Enrera
Rochelle EnreraLv10
15 Nov 2020

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Related textbook solutions

Physics: Principles with Applications
7th Edition, 2013
Giancoli
ISBN: 9780321625922

Related questions

 What is the resistance of a lightbulb that uses an average power of 75.0 W when connected to a 60.0-Hz power source having a maximum voltage of 170 V?

 

Determine the rms voltage first since the given 60Hz power source suggest AC current. 

  

  

Then, compute for the arms current.

  

  

Since from Ohm's Law, V=IR

The resistance of the light bulb may be calculated using the formula

  

  

 

The rms current through a light bulb is 0.679 A when the bulb isconnected to a standard 120 V rms source.
(a) Find the bulb's resistance.


(b) Find the peak instantaneous current.


(c) Find the peak instantaneous voltage.


(d) Find the average electrical power used by the bulb.

Three identical 60.0-W, 120-V lightbulbs are connected across a 120-V power source, as shown in Figure P28.72. Find (a) the total power delivered to the three bulbs and (b) the voltage across each. Assume that the resistance of each bulb is constant (even though in reality the resistance might increase markedly with current). 

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