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23 Nov 2019

A 80 W light bulb operates on a potential difference of 75 V.
(a) Find the current in the bulb.
___________ A

(b) Find the resistance of the bulb.
__________ O

(c) If this bulb is replaced with one whose resistance is doublethe value found in part
(b), is its power rating greater than or less than 80?
By what factor?


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Jean Keeling
Jean KeelingLv2
1 Apr 2019

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Related textbook solutions

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

Related questions

25.35 Light Bulbs. The power rating of a light bulb (such as a 100-W bulb) is the power it dissipates when connected across a 120-V potential difference. What is the resistance of (a) a 100-W bulb and (b) a 60-W bulb? (c) How much current does each bulb draw in normal use?

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how much power is dissipated in a light bulb that is normally rated at 75 w

The power rating on a light bulb indicates how much power it would dissipate when it is hooked up to the standard household voltage of 120 V (this rating does not mean that the light bulb always dissipates the same amount of power, assume that the resistance is constant in this case).

A. How much power is dissipated in a light bulb that is normally rated at 75 W, if instead we hook it up to a potential difference of 60 V?

B. How much power is dissipated in a light bulb that is normally rated at 75 W, if instead we hook it up to a potential difference of 120 V?

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