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27 Nov 2019

Many lamps have a switch that lets you choose three levelsofbrightness. The bulbs in this type of lamp have not one buttwofilaments inside, which are wired in parallel and have theirownswitches. One of the filaments is designed to give off morelightthan the other when connected to the average 120 V emfprovidedby a wall outlet. In the dimmest position, only the leastbrightfilament is on. In the next position, only the brighterfilament ison. In the brightest position, both filaments are on.Suppose one ofthe filaments consumes 45.0 watts andthe other consumes 70.0 watts.What is their equivalent resistancein the brightest position (whenboth are turned on)?

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Related textbook solutions

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

Related questions

Figure P27.3 shows the interior of a three-way incandescent lightbulb, which provides three levels of light intensity. The socket of the lamp is equipped with a four-position switch for selecting different light intensities, with the positions described as follows: (1) off (switches S1 and S2 both open), (2) switch S1 closed, (3) switch S2 closed, and (4) switches S1 and S2 both closed. 

The lightbulb contains two filaments. When the lamp is connected to a 120-V source, one filament receives 100 W of power and the other receives 75 W. What is the total power input of the light bulb when

(a) only switch S1 is closed

(b) only switch S2 is closed

(c) both switches are closed

(d) What if? Suppose the 75-W filament breaks and no longer is able to carry a current. How many switch positions will result in the light leaving the bulb and what will be the power input to the bulb in those positions?

Figure P27.3 shows the interior of a three-way incandescent lightbulb, which provides three levels of light intensity. The socket of the lamp is equipped with a four-position switch for selecting different light intensities, with the positions described as follows: (1) off (switches S1 and S2 both open), (2) switch S1 closed, (3) switch S2 closed, and (4) switches S1 and S2 both closed. The lightbulb contains two filaments. When the lamp is connected to a 120-V source, one filament receives 100 W of power and the other receives 75 W. What is the total power input to the light bulb when (a) only switch S1 is closed, (b) only switch S2 is closed, and (c) both switches are closed? (d) What If? Suppose the 75-W filament breaks and no longer is able to carry a current. How many switch positions will result in the light leaving the bulb and what will be the power input to the bulb in those positions?

Figure P27.3

Chapter 27, Problem 3P, Figure P27.3 shows the interior of a three-way incandescent lightbulb, which provides three levels

Figure P27.3 shows the interior of a three-way incandescent lightbulb, which provides three levels of light intensity. The socket of the lamp is equipped with a four-position switch for selecting different light intensities, with the positions described as follows: (1) off (switches Si and S2 both open), (2) switch Si dosed, (3) switch S2 dosed, and (4) switches Si and S2 both closed. The lightbulb contains two filaments. When the lamp is connected to a 120-V source, one filament receives 100 W of power and the other receives 75 W. What is the total power input to the light bulb when (a) only switch SI is closed, (b) only switch S2 is closed, and (c) both switches are dosed? (d) What If? Suppose the 75-W filament breaks and no longer is able to carry a current. How many switch positions will result in the light leaving the bulb and what will be the power input to the bulb in those positions? 

 

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